Macdrive 9 Standard Serial Number Added By Users

Macdrive 9 Standard Serial Number Added By Users

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Fixed: Windows Explorer slowdown when right-clicking on a computer connected to a network but without Internet access.Fixed: Several stability improvements to fix BSODs reported via Windows Error Reporting.Improved: Offline activation automatically offered when encountering errors with internet activation.Improved: Added specific dialogs for some activation scenarios, such as if attempting to activate MacDrive 9 Standard with a Pro serial number, or vice versa.Improved: Clearer instructions in disk protection warning when reformatting a Mac disk with Windows.Fixed: Misc. bugs.

With the release of the Mac OS X 10.2.2 update on November 11, 2002, Apple added optional journaling features to HFS Plus for improved data reliability. These features were accessible through the GUI, using the Disk Utility application in Mac OS X Server, but only accessible through the command line in the standard desktop client.[6]

Formerly, HFS Plus volumes were embedded inside an HFS standard file system. This was phased out by the Tiger transition to Intel Macs, where the HFS Plus file system was not embedded inside a wrapper. The wrapper had been designed for two purposes; it allowed Macintosh computers without HFS Plus support in their ROM to boot HFS Plus volumes and it also was designed to help users transition to HFS Plus by including a minimal HFS volume with a read-only file called Where_have_all_my_files_gone, explaining to users with versions of Mac OS 8.0 and earlier without HFS Plus, that the volume requires a system with HFS Plus support. The original HFS volume contains a signature and an offset to the embedded HFS Plus volume within its volume header. All allocation blocks in the HFS volume which contain the embedded volume are mapped out of the HFS allocation file as bad blocks.[2]

For my MacBook Pro (Early 2015) this showed the Serial-ATA Device Tree, from which I was able to get the model number for my SSD. This related question, How to get serial number from Mac hard disks might help if you think you have an HDD.

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Want to ask a Mac guru a tricky question Ask, \"What was the first hard drive for the Macintosh\" You may get a completely wrong answer, like \"Macintosh Hard Disk 20,\" or another hard disk system. It's a trick question because technically there are two answers!Today we are going to explore the Tecmar MacDrive, one of the first two hard disk systems available for Macintosh in 1984, and one of the answers to our \"first hard disk\" question. First we will talk a little about hard drives and Macintosh, then we will take a look at how the MacDrive works, and finally we will open the MacDrive and see what components it's made of.Hard Drives and the MacintoshAs we have mentioned in some earlier Mac 512K Blog articles, it seems upon first glance that Apple had absolutely no plans for a hard disk system on the Macintosh in 1983 and 1984. The Macintosh File System (MFS) was non-hierarchical and the Finder did a poor job at managing more than 100 or so files. And where would you attach a hard drive The Macintosh had only two RS422 ports and a disk port that Apple said was only for floppy drives. So clearly Apple had no plans for a hard disk on the Macintosh, right Doing some more digging, it turns out that this impression is incorrect. The Macintosh team did indeed have plans for a hard disk system for Macintosh, just not the way that we expect as we look back across 30 years. In fact the potential for a hard disk is hidden in several places, such as Inside Macintosh - where the chapter on the Events Manager says that a Disk inserted event could be used for a hard drive. In an interview, Steve Jobs referred to a \"disk server,\" a url= =491]network hard disk with file management software[/url]. This is an interesting subject which is uncovered in a later blog article. For now, we will concentrate on the first two hard disk systems released for Macintosh.Tecmar MacDrive and Davong MacDiskThe first two hard disk systems available for Macintosh in 1984 were the Tecmar MacDrive and the Davong MacDisk. The MacDrive was first on the market and on users' desktops in summer 1984, followed by the Davong MacDisk a couple months later, as a number of magazine articles, reviews, and Usenet articles mention.Tecmar demoed its hard disk system, first called \"Apple Jack,\" at the Ninth West Coast Computer Faire in April 1984, according to an article in InfoWorld, April 23, 1984, p. 53. The article stated that shipments were planned for this summer, and the product would be available in four configurations from 5 to 15 MB, featuring a 5 MB removable cartridge system in addition to a 10 MB fixed disk. The price range was from $2,000 to $3,000. The hard disk system connected to one of the Macintosh serial ports. Apparently the software had not been finished yet because Tecmar president Martin Alpert was reported as saying that \"he did not know if the hard disk would be controlled through an icon on the Macintosh or through some other method.\"In an August 1984 InfoWorld article, \"Problems for Mac Hard Disks,\" it was reported that Davong hard disks were shipped to stores in July, and Tecmar \"began shipping two months ago.\" The article further stated that these two companies are the only ones who manufacture Macintosh hard disks, and that Apple had \"specific plans to manufacture its own hard disk for the Mac,\" according to Daniel Kottke, a Macintosh hardware engineer quoted in the article.Both disk systems connected to one of the Mac's serial ports, and installed a device driver to access the disk. The device driver translated the Macintosh File System calls to open, read, and write files into block-level commands to the hard drive. The disk was formatted as MFS, the same as a 400K floppy disk, and it appeared on the desktop just like any other ordinary floppy disk. First versions of the hard disk driver did not support partitioning, a way to divide the 5 or 10 MB disk to look like multiple, smaller disks. Partition utilities came later, and with smaller volumes, the Macintosh Finder was much better at handling the files stored there.Being serial devices, the hard disk systems' transfer rates were limited to the maximum rates of the Macintosh RS422 port and Zilog SCC chip. Normally clocked at up to 230.4 Kbaud for AppleTalk networking, the RS422 ports could be externally clocked and driven much faster if needed. The Tecmar ran at about 700 Kbaud, the Davong at around 810.The removable 5 MB cartridge disk system in the MacDrive meant that storage could be readily and rapidly expanded by purchasing additional disks. It also provided a way to back up the fixed 10 MB Winchester disk (if present). The MacDrive could be configured with either:a single 5 MB removable drivetwo 5 MB removable drivesa single 10 MB fixed hard diskor a removable drive and a 10 MB fixed hard disk for 15 MB total online storage.A basic one-drive system listed for $2,000. Cartridges retailed for $125.Early Reviews of Macintosh Hard DrivesEarly reviewers of Macintosh hard drive systems typically reported being underwhelmed by the experience: buggy drivers, slowdowns with large numbers of files, reliance on a boot disk, and incompatibility with copy-protected software. Response was often only slightly better than the stock 400K floppy. About the only good point was that if you needed to store and access several megabytes worth of files in one place, now you could.Edward Tecot got to see a demo of both the Davong and Tecmar hard disk systems in July 1984. He reported what he saw on the Info-Mac mailing list Edward Tecot on fa.info-mac, 16 Jul 1984 wrote:They both use the RS422 port, as far as the Mac is concerned, they are AppleBus devices. Neither can be booted directly, you must insert a 'master' disk first. Once they are up, however, the hard disk supports the system, so the master can be put aside (until you get a system error). Both of the systems are slow as far as hard disks go, however, the Davong is faster than the Tecmar, which is a noticable improvement over the internal floppy.The Tecmar supports removable 5-meg cartriges, the Davong supports larger storage sizes (10, 15, 21, 32, 40 meg). The Davong also seems to be more reliable, but it does have its drawbacks. For one, the Tecmar sports an additional 9-pin connector on its back, unlike the Davong.Now to be fair, some of the shortcomings of early Macintosh hard disk systems were not the fault of the vendor. Recall that in summer 1984, the Macintosh still only had 128K of RAM. The 512K configuration did not become common until late 1984 and 1985 (except for users with an Apple Lisa 2/Macintosh XL, who always had 512K). Furthermore, the latest version of Finder at the time was 1.1g. While it offered several improvements and speedups over version 1.0, it still had a ways to go. It wasn't until spring 1985 that Finder 4.1, the last and best of the MFS-only Finders, was released. The Finder kept the entire disk catalog in RAM, which meant that 128K Macs frequently ran out of memory when using a hard disk filled with too many files. Early Finder versions were also slow with more than several dozen files on a disk. Both the 512K Fat Mac and Finder 4.1 solved some of these problems.But still, power-users who spent several thousand on a hard disk system expected not only greater storage capacity over a floppy, but also greater access speed. Sadly, lack of speed was a common complaint with the Tecmar MacDrive, as Harry Lewis also observed in July 1984: Harry Lewis in fa.info-mac, 17 Jul 1984 wrote:I too have seen the tecmar attached to a Mac and am very unimpressed with its speed. Launching Macpaint off the Tecmar takes at best 50% of the time it takes to launch it from the internal floppy, maybe more. In addition, whenever you run an application from the Tecmar, if there is a floppy in the internal drive, that drive spins for a few seconds both on launching from the Tecmar and on returning to the finder. (Why)John Clark reviewed the Tecmar MacDrive in August 1984. He had several negative remarks about the system, which in summary were: the Macintosh cannot boot directly from the hard disk; the flat MFS directory runs out of catalog space before the drive is full of files; the drive allocated 20K of space at a time, meaning that storing many small files (less than 20K) results in wasted space; access speed is faster than a floppy, but not especially so; and finally, that copy-protected applications, including those that ask for a master disk such as Microsoft Multiplan and Habadex, are incompatible with the MacDrive.Mr. Clark also lamented the \"coming of appliance computers\" and their ease of use meant that the user manuals were correspondingly dumbed-down, and not of much use to power users. The MacDrive has a second serial port, but the manual does not say how to use it, nor how to install copy-protected software for floppies.In conclusion he said, \"I am guardedly optimistic about the usability of the hard disk, much as I have been guardedly optimistic about the Mac: with the right software, it will be a nice thing to have.\"Dan Winkler also was not at all pleased with the Tecmar MacDrive. \"Tecmar should be prosecuted for false advertising,\" he wrote in his October 1984 review of the system, which outlined several common faults of the system: slowness, wasteful storage allocation, and the need to boot from a floppy. He closed his review by remarking \"we think that the Tecmar is a nice piece of hardware but that there are certain applications for which the current software (finder, flat file system) is quite inadequate.\"In Kevin Goldstein's review of the Tecmar MacDrive in St. Mac July 1984, pp. 12-13, he said that the MacDrive has the capability to be used on AppleTalk as a network hard drive. The upgrade could be as simple as a new ROM and driver for the MacDrive. One downside is that the transfer rate would be reduced down to 240 kilobits per second, the speed of AppleTalk over LocalTalk wiring.Tecmar filed for Chapter 11 bankruptcy in June 1985 and shortly thereafter was acquired in 1986 by a technology holding company. Poor product design and tech support that goes like this tends to lead a company to fail: Russell Reid in Info-Mac Digest, 8 Oct 85 wrote:No matter what kind of message I left, if someone eventually called back, they had received no information but my name. Sometimes the person who called me back would transfer me to technical support, which was always busy, and then transferred me automatically to the message center. Again. Once I was transferred three times in a single call without talking to any human or even leaving a message. All this at daytime rates, all at my own expense.Using the Tecmar MacDriveThe Tecmar system came with the following components: the drive cabinet, an RS422 serial cable, power cord, MacDrive system disk, a comb-bound Users Guide, and a 5 MB cartridge (if your MacDrive has a cartridge drive). I have all these things except for the cartridge. My MacDrive is configured with a 10 MB hard disk and a 5 MB removable drive.According to what's written in the back of the manual by a previous owner, my MacDrive was originally purchased in late 1985. It came with version 2.2 of the MacDrive System disk, dated 1985, part number 936456-A. There is also a new v2.3 of the System Disk, and I made my own copy of this too.Setup is so straightforward, that they took eight pages to explain it! And all you're doing is connecting a serial cable between the MacDrive cabinet and the Mac! They basically used one giant line illustration on each page. The entire manual is like this: loads of white space, with gigantic illustrations or screenshots on practically every page. You'll flop through it once, then probably never look at it again.On the Macintosh, connect the serial cable to either modem or printer port. If you're using AppleTalk, then connect it to the modem port. Connect the other end of the serial cable to \"Serial 1\" on the back of the MacDrive. If you have an ImageWriter printer, connect it to \"Serial 2\" on the back of the MacDrive. The MacDrive has a hardware print spooler/buffer.The serial cable that came with my MacDrive doesn't exactly fit the back of the Mac's case. The plastic housing around the male end is slightly too fat. This is one of the design problems that was fixed with the Macintosh Plus case. I solved the problem by removing the plastic housing, and leaving the end bare.As with the Hard Disk 20, you need to use a boot floppy to start up the Mac. Make sure the MacDrive is powered on first. The Tecmar System Disk will show a startup screen with version number and copyright date. After a few moments it will transfer control to the System files on the Tecmar-- either located on the 10 MB hard disk, or 5 MB cartridge, whichever is present. If there's no response from the MacDrive, or no system, the Mac will boot solely from the floppy.That's what happened for me-- when I first powered on the Tecmar MacDrive, the red LED on the hard disk was flashing. I booted from the Tecmar System Disk, but there still was no disk activity. It turned out that the old hard disk needed some time to warm up. In this case, about an hour. This drive is over 30 years old and may not have much life left in it.On the System Disk is the Volume Manager. This is the utility application that you use to create, delete, and mount volumes. You can also initialize a disk for Tecmar, either a 5 MB cartridge, or the 10 MB fixed disk. Version 1.8, dated July 30, 1985, is what comes on the version 2.2 System disk. When I launched the application, this is what I saw:Not good. This is not what you want to see. In my case, the hard disk was old and needed some time to warm up. After leaving the system on for an hour, the hard disk was recognized. If your MacDrive is not connected, is powered off, or is otherwise completely non-functional, you will not be able to use Volume Manager. You'll see an error message when you launch it.You can partition your MacDrive in up to 20 volumes. Of these 20 volumes, you can mount two at a time on the Macintosh 128K, or four at a time on the Mac 512K. Wow, aren't you glad you spent the extra money to get a 512K Fat Mac My 10 MB hard disk had been partitioned in two: \"The System,\" and \"test volume.\" This screenshot shows that The System is mounted, with a check mark next to its name.Selecting a volume from the list shows its size and usage information. Click the Mount button to mount it.The original 1.0 version of the MacDrive did not support partitioning. You either had one giant 5 MB volume on a removable cartridge, or a huge 10 MB volume on the internal hard disk. Version 2.0 of the MacDrive driver added partitioning, but to upgrade, you needed to reinitialize the disk and start over! The manual suggested you copy all your files to floppy disks before beginning to reinitialize the disk. Ouch.If your MacDrive is configured with more than one drive, as mine is, you can switch between drives in the Options menu. If a drive is present, but not available for some reason, it will be grayed out. In my case, I don't have a 5 MB removable cartridge, but the drive is there, so the option is dimmed. If your 10 MB drive is out of order, it will be dimmed as well.I am looking for a 5 MB SyQuest cartridge to use with my MacDrive. If you have an extra one, please send me an email. My address is at the end of this article, in bold.One of the best things about the Volume Manager is its online help system. It is in some ways more helpful than the printed manual. But only if your MacDrive is working correctly.Here are a couple of example screenshots of the online help:Choose Quit and return to the Finder after mounting some volumes, and hopefully you'll see them on the desktop like below. They work just like normal 400K floppy disks.As mentioned earlier, the MacDrive includes a hardware print buffer. I did not try to use it, as I am not currently using a printer with my Mac 512K. Perhaps later I will try it. According the manual, all you need to do is use the Choose Printer desk accessory to set the port which the MacDrive is connected to, and you're all set. The MacDrive automatically handles the rest.Unfortunately, my MacDrive did not last much longer beyond the time I took these screenshots. After opening it up to fiddle around, the hard disk stopped working correctly.Inside the Tecmar MacDriveThe Tecmar MacDrive is a conglomeration of several off-the-shelf parts on top of a custom-designed controller board. Its principal components are:Tandon TM252, a 5.25\", half-height, 10 MB, ST506-compatible hard disk driveSyQuest SQ 306R, a 5.25\", half-height, 5 MB, ST506-compatible removable cartridge driveXebec S1410, a SASI to ST506 hard disk drive controllerTecmar MacDrive controller board with M68008P8 microprocessor PSA-523T power supply manufactured by Phihong Enterprise Co., Ltd.The MacDrive weighs a living ton. Its case seems to be made of steel, and is secured with no fewer than 10 screws: three on the back edges and seven on the bottom edges. After removing the screws, slide the top part of the case back, away from the front of the MacDrive.You should see the 5.25\" hard disk (or cartridge drive) on one side and the power supply housing on the other.Remove two screws on either side of the hard disk and slide it out the front of the MacDrive after removing the power, control, and data cables. My hard disk is a Tandon TM252. Other MacDrives may have shipped with a Shugart SA712. Any 10 MB, 5.25\" half-height hard disk that uses the Seagate ST506/412 interface should work in the MacDrive.With the top drive removed, you should see the removable cartridge drive below.This turned out to be none other than a SyQuest SQ 306R removable cartridge drive. The SyQuest story is actually rather interesting, but I don't know if we can tell it here, as this article is already getting long. Like the Tandon hard disk, the SyQuest drive is half-height and uses the same ST506/412 interface. Its cartridge, the SQ100 (sometimes called Q-PAK), has a 5 MB formatted capacity.Remove another two screws on each side of the SyQuest drive, slide it out the front, and proceed down to the next layer in the MacDrive. This little gem of a board is an Xebec S1410. It controls one or two ST506-compatible drives, and connects to the host computer using SASI. What is SASI It's the predecessor to SCSI. It was a disk controller interface developed by Shugart Associates in the late 1970s. SCSI was developed and standardized out of SASI in the early 1980s, around the time the original Macintosh was being created. They say that SASI is forwards-compatible with SCSI-1. Maybe we'll find out if that's true in a later blog article.Remove the 4 plastic screws and several cables to reveal the final, bottom-most layer of the MacDrive: the Tecmar MacDrive controller board. This board, which has printed on it \"MACDISK PCB 700007 REV E,\" contains several components. First of all, it is a complete microcomputer system, containing a Motorola M68008P8 CPU with ROM (labeled v1.2) and 16K of RAM. There is a Zilog Z8530 Serial Communications Controller to drive the two serial ports. An early review of the MacDrive mentioned future capability to be used as a network file server on AppleTalk. I have no idea if this plan ever came to fruition.The Motorola M68008 is a cut-down version of the powerful 68000 CPU inside the Macintosh. The 68008 has an 8-bit data bus and a 24-bit address bus, similar to the 65C816 in the Apple IIgs. Because it could only move half as much data on the bus at once, it was about half as fast as the 68000. It had the same instruction set and same features as the 68000, however.The 68008's RAM is provided by eight 16 kilobit MB8118 DRAMs in sockets. There is a twin set of solder pads for another 8 DRAMs. With only 16K of RAM, one wonders how useful the printer buffer truly was. There are a few jumpers scattered around the board. Some of these may set the drive configuration: one drive versus two installed, for example.The large 50-pin IDC connector at the far end of the board (shown at left in the photo above) connects to the Xebec S1410 controller and is presumably the SASI interface. It's tempting to try it, but I highly doubt that you could directly connect a bare SCSI hard disk to this connector and have it working.Upgrades and Modifications for the Tecmar MacDriveWith so many standard components, power users had a couple of modifications to the old Tecmar MacDrive. The Macintosh Plus, released January 1986, standardized SCSI and HFS on the Macintosh, and it wasn't long before users found out how to convert the MacDrive to support the Macintosh Plus and its new features.SCSI ModificationIn November 1986, David B. posted on the Delphi Mac bulletin board asking about converting the MacDrive to SCSI. He said, \"I have a friend with an old TecMar 10 Meg drive. He's taken the thing apart and run a cable to the SCSI controller inside and is attempting to get it to work as a SCSI drive.\"A few months earlier in May, David Whiteman posted on net.micro.mac that he had converted his MacDrive to directly connect to the SCSI port on the Macintosh Plus. He said it cost less than $20 to do this, and as a result, you could format the drive as HFS, although you lost the ability to partition the volume. As an HFS-formatted SCSI drive, it was now possible to boot directly from the drive with a Mac Plus. The only downside, he said, was that you needed either a Macintosh Plus or a Mac 512Ke with a 3rd-party SCSI port to use the drive. We will show how to add SCSI to a Mac 512K in a future blog article.I was not able to find any exact instructions, but it sounds like the modification may be as simple as running a Centronics cable directly to the 50-pin IDC connector on the Xebec S1410 board. Then you could use a standard Apple SCSI System cable to connect from the Mac to the MacDrive. The back of the MacDrive case even has an appropriately-sized cutout that could be removed for the external SCSI connector. This is a project which I'll investigate later.HFS ModificationAt last there was a file system designed for hard disks: the Hierarchical File System, HFS, first released in late 1985. Werner Uhrig posted instructions for formatting the MacDrive to use HFS in May 1986. Part of the procedure involved copying Tecmar's resources, including a DRVR, and an INIT resource, to a new System 3.x file using ResEdit. Afterwards, you can mount the volume and initialize it for HFS using Erase Disk from the Special menu in the Finder.Interestingly, Uhrig's Usenet post also mentions problems with hard disk stiction, and a solution-- a light tap on the case-- to get the drive spinning again. Which shows that stiction isn't just a problem with old drives today, but was also a problem 32 years ago. Macintosh Plus and 128K ROM CompatibilityWith the release of the Macintosh Plus and its expanded ROM in 1986, Tecmar users discovered that their boot disk was incompatible with the new machine.The solution was to copy the Tecmar driver and other resources into the System 3.2 resource file on a startup disk, and use that disk instead of the Tecmar-supplied boot disk, as this article explains: Re: HELP: Tecmar disk/Mac+ ROMsSimilar information is also provided in a post in this Delphi Mac Digest from October 1986 (it's around the middle of the digest-- search for Tecmar).Fixing the Tandon TM252 hard diskMy hard disk did not last long. When I first powered on the MacDisk, the red LED continuously flashed dimly. When it was mounted and working, the LED flashed brightly for each head seek.After some troubleshooting and reading through the Tandon TM252 documentation, I determined that the drive was not seeking to track 0 on powerup. And it wasn't seeking to track 0 because the Hall effect sensor that detects the index hole, and closes a circuit when the index hole is detected, had failed.This sensor is shown in the photo below, at left. It's a short, cylindrical part with a red and black wire coming from it. Looks like a silver cigarette butt.John Guffin from VCFed sent me a spare TM252 drive for parts. I swapped in the replacement sensor and sure enough, that did the trick! The drive seeked to track 0 once the spindle reached correct speed, as measured by the index sensor.However, the red LED is now steady-on. It does not flash or blink or do anything. I think this indicates an error condition, but I don't know what it could be. I also noticed that the stepper motor for the head arm seems to be constantly on, and is uncomfortably hot to the touch.Meanwhile, I heard a pop and smelled a bad smell, which probably came from the power supply. I replaced two RIFA safety capacitors, 0.1uF X 250VDC.Things are not looking good for this drive. I have a few options: I can continue troubleshooting this drive and try to get it running, or I can replace it with another drive, or I can replace it with an ST506 emulator. This last option is most expensive and most interesting. There are boards for sale which use solid-state storage on an SD or Compact Flash card to stand in place of a spinning magnetic hard disk, and which communicate with the ST506 interface.Since publishing this article, Joseph Rettler wrote to me in November 2022 with the following information about the hard disk mechanism:Hello, I just read your article on MacGUI about the Tecmar MacDrive and I had some comments about it. You say that they shipped with the Tandon TM252 or Shugart SA712 - If this is true, that does not bode for the reliability of these units. Both of these drives are notoriously unreliable. The Tandon TM252 uses an external rotary band swingarm - the band is made of steel and changes shape with temperature, which can throw the head stack out of alignment. Typically the rotary band is inside the drive where it is isolated from the heat of the rest of the system - not so on the TM252. This also adds an extra external bearing and seal, on the swingarm which is a nice extra failure point for contamination. The swingarm itself is also plastic, which is very susceptible to warping and cracking due to age, further throwing the drive out of alignment. In many cases, a stiff bearing can cause the swingarm to distort or break during operation as well. Finally, the drives are held together with metal L clips which lose their shape with age and allow dust and dirt to enter the drive. The SA712 suffers from other issues. Since you said the drive needed \"an hour to warm up,\" this suggests that the drive probably is suffering from these temperature issues. That said, the flashing indicator could also be another problem. You might find information about that here.Possibly needs oil on the spindle motor. There is a grounding tab over a single ball bearing - You can drop some machine oil here to help with that. Here is some information on the Xebec S1410 SASI controller:The S1410 is actually pretty versatile, Xebec says that it will support any interleve in both 32- and 17- sector formats, and I don't see any reason it couldn't handle larger disks. Interesting that they are running SASI over RS422. The only limitation on the size of the drive is going to be software side, the Tecmar utility is sending the geometry to the S1410 on format and at every boot. With modification, I see no reason this setup couldn't be used with drives >100MB, even!The geometry being sent to the controller is CHS, but the sectors are set by a jumper on the controller. There are 306 cylinders and 4 heads with write precompensation starting at 128, which is shared by the Tandon TM252, Shugart SA712, Seagate ST-412 and ST-212 and ST419 (unused surface 4/5), Miniscribe 1012 and 8412 (last tracks unused, does not need precomp), Epson HD-850, Ampex PYXIS-13 (with early precompensation), BASF 6186 and 6188 (unused inner tracks), CMI 5412, Rodime RO252 and RO352 (exact match) or RO202E (unused inner tracks) or RO203 (unused inner tracks and unused surface 4/5). Any drive with >=306 cylinders and >=4 heads with precompensation starting at cylinder 128 or later should work just fine. Precomp at 128 or later is pretty much universal except for some strange drives (BASF 6184) or early drives that do not meet spec anyways. Most later 10MB units only have 2 heads and 615 cylinders which is a problem - You have to have 4 heads. This leaves a lot of inner tracks unused. There may be more valid mechanisms but those are all of the ones that are \"close enough\" which I saw at a glance in the final edition of the CSC Hard Drive Bible. The SyQuest drive parameters are also always sent - You could in theory attach a regular fixed disk drive to this port as well, the controller is watching for the READY and SELECTED signals, again the software side is what determines everything else. With matching geometry you could throw another drive in there no problem, although it would still be listed as removable.I hope this message finds you well and I hope this helps a little bit in keeping this piece of history working. I know you said the drive died after disassembly of the unit, which does not surprise me, but maybe this can help you find a compatible replacement. Thanks for reading, JosephI am also seeking a 5 MB SyQuest SQ-100 cartridge to use in the removable drive. I have no idea if this drive works or not. Its red LED blinks once just briefly when I switch on the MacDrive. If you have an extra 5 MB SyQuest cartridge, please send me an email. My address is below, in bold.Once again we are at the conclusion of another Mac 512K Blog article. Our next article will show and tell all about the TOPS networking system, an alternative to AppleShare that used the AppleTalk network. The Mac 512K Blog wrote:This blog chronicles the Macintosh 512K and my projects with it. We will test software, fix hardware, program it, hack it, and generally take the 512K Macintosh to its limits.Do leave any feedback you may have, either to my email dog_cow@macgui.com or by posting a comment to this article. 153554b96e

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