SCSI DRIVE (50 PIN) - Is there an ADAPTER ??

Macintosh / G5 1.8 powerpc
February 2, 2011 at 19:02:53
Specs: iMac, G5


Older Macintosh (Power Mac)....connected to and EXTERNAL SCSI Drive via those old Thick SCSI Cables.

Well....the SCSI Connection interface WITHIN the external drive enclosure has failed.

HOWEVER....I was able to get the drive itself out and connect it to an external power supply. The drive spins up and sounds OK.

Now...I need to get the data off. Is there some sort of 50 Pin SCSI to USB adapter?

OR...any other suggestions for attaching this drive?

Any help appreciated. THANKS

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February 3, 2011 at 08:06:14
... "kev100" click here

... "ace_omega" your link is hashed out on the road to nowhere!

Angel Decoy
... Posting is provided "AS IS" with no warranties

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February 3, 2011 at 08:31:18
I'm a bit puzzled. An external SCSI enclosure usually contains no electronics other than the power supply; the SCSI interface on the drive is just connected directly to a socket on the case. It sounds like the failure is with the SCSI card in your Mac (or the PSU in the enclosure). You can pick up second-hand SCSI cards on eBay for next to nothing, so that might be a possibility.

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February 3, 2011 at 11:59:19
Well, the drive is mounted in an enclosure.

But, the bare drive itself has a ribbon cable connected to it....the other end of the ribbon cable connects to some type of circuity within the enclosure.

The external connectors (those old wide SCSI things that look kinda like a parallel printer connector) connect to this circuitry through the enclosure wall.

In other words...within the case, there is some circuitry (other than just the power unit...that sits between the the external connectors and the drive itself.

To look at the bare looks JUST LIKE an IDE ATA hard drive.....Except, it has a 2 rows of 25 pins (not 19 or 20).

The drive model: DPES-31080 (IBM) and P/N: 85g3623


Hey, and the other folks...thanks for those links.

Google is pretty cool.....however, I did try multiple searches for the needed adapter before posting here...nothing came up (that I could find).

Those results produced by the provided links include adapters which do not connect to this BARE drive (as described).

It was nice for you to provide them, nonetheless.

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February 3, 2011 at 12:34:28
That bare drive will connect directly to a SCSI controller in a computer, assuming that you have the appropriate cable. The extra bits that you see are probably just terminators for the SCSI bus and/or a selector for the SCSI device number. If your PowerMAC has an internal SCSI disk you should be able to hook this one up to a spare cable on the SCSI cable; there will be jumpers on the disk to set its number on the bus (normally between 1 and 6, just set them to a different value than the current disk). Of course, this assumes that the disk is still working.

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February 3, 2011 at 13:14:38
I say good luck. I have been trying to get a usb to 50 centronics for a while. Seems to be hard to find less than $100.

If you have access to a isa slot then you may find a adapter cheaper. Some internal cards have both types of connectors for 50 pin and you will also have to check termination and buss sequence again.

Might be that some repair place has an old mac and would be willing to connect to it for a service fee..

"The era of big government is over," said Clinton 1996

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April 9, 2011 at 15:42:10
I was wondering if you found any solution to your problem b/c i have the same situation. I have some older mac scsi drives (50 pins) and want to connect them to see if i can pull some data off of them.


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May 2, 2011 at 11:05:30
Sorry...have not checked back lately.

I had an adaptec scsi card...which would only work in a I connected the drive and got a free utility that allows a PC to read MAC volumes and files.

However, while the PC could see the drive, the utility could not access the partition (or whatever they are called on a MAC) kept returning that it could not find a (mac partition) on the said drive.

I ended up sending it to one of those recovery services (one of the big ones)...they were able to see all the needed data....but we simply could not afford the 1,500+ price to retrieve it.

To me honest....I think that if I could get this drive (I think what is has is called "wide-scsi") to connect directly to another mac..that it could read it no problem.

Do newer Macs have ports to connect to these older 50pin drives, even via some type of adapter cable?

And...if the connection can be made....can newer OS's access data on Mac drives with older OS's ?

I can supply it with power via an external power connector...I just don't have/know of how to get the data connection.

Thanks very much.

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