HI, I have an old 5.25" floppy drive and I'd like to conect it to my computer. Now, I could open the case and install the drive, of course, but I'm seeking a more convenient solution. There are numerous USB Floppy drives for the 3.5" format, so maybe there's something similar for 5.25"?

Also, since there are adapters for PATA(3.5" and 5.25") and SATA all in one device, that connect to USB, so maybe there's something similar for Floppies?

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It appears that most USB floppies use an integrated controller, and don't expose the floppy cable in any way where it could be misused by perhaps connecting a 5.25" drive. That said, it also appears that there is an active ancient data and media community that is building up controllers and tools to deal with lots of ancient stuff.

One such is http://www.deviceside.com/ which makes a controller and matching PC software that can read (but probably not write) DOS and some CP/M format floppies.

There is also http://www.kryoflux.com/ which is taking a different approach. Their controller brings back the analog track content and can potentially decode nearly anything written to a floppy. No clue about price, but if you have a crate of valuable data written by an Apple ][ (or something even more obscure) there may not be very many other choices.....

A quick skim doesn't turn up any complete solutions. I'll be interested to see what other SU users turn up.

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The cable being exposed or not is irrelevant since 5¼" drives use a different connector from 3½" drives: collectibles-articles.com/antique/collectible-image-large/… – Synetech Mar 3 '11 at 3:20
@Synetech, different connector true, but it shares (most) of the pins of the same cable. A classic PC AT era cable had connectors for both sizes of floppy on it so that drives A and B could be either size. If the external 3.5" box has a connector between the drive and controller then it would be easy (or easier) to connect to a 5.25" drive instead. – RBerteig Mar 3 '11 at 6:20
True, most of the dual cables had a pin connector for the system-end, so one of those should hopefully be sufficient. If I recall correctly though, there were many ways to connect a drive in a way that it wouldn’t work (for example before or after the flip). (I’m sure that I’ve still got an edge-connector only cable in a box somewhere…) – Synetech Mar 3 '11 at 15:06
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OK, this is just waht I needed to hear. I will now make my own universal floppy controller. I was just wanting to make sure, that there really is no other around. – polemon Mar 6 '11 at 10:26
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Apparently you can buy a PCI controller that reads disks from a number of formats, but can't write them. http://www.deviceside.com/fc5025.html which RBerteig already mentioned, though they do read from Apple ][, Commodores, and some stuff neophytes like me have never even heard of.

Also, which formats do you need to access? There is a full solution at http://adtpro.sourceforge.net/ for Apple ][ disks, but it requires either a real Apple ][ or an emulator. I was unable to turn up anything for other formats in the quick skim I did. Guess I'll wait for some more super users to do a little better.

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Sadly, as the others have found out, there does not seem to be a simple, ready-to-buy, plug-and-play external USB 5.25" floppy drive (just not enough demand probably).

As mentioned, there are some controllers that can be purchased. There is also a PCI expansion card that is geared primarily towards Amiga users, but is Windows compatible. It can even write disks, but at £90, it’s pretty pricey. There are some discussions by people on kludging something together at home, potentially at significantly less cost than either option.

There is a discussion thread by some Mac users on how to make one out of an existing 3.5" USB drive. Another extended USENET thread has a similar discussion. Unfortunately neither one really and concretely confirmed success. However, the attempts and discussions provide some useful information for anyone who wants to try their own hands at it. Some points of particular note include

  • The need for an adapter to convert from the 5.25" drive’s edge-connector to the pin connector used by 3.5" drives
  • The need for an external power supply since USB cannot provide the 12v needed by the 5.25" drive
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