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Shugart 851 error

Posted: Wed Jan 10, 2018 4:45 pm
by adamsabi
I have successfully connected up a refurbished 8" floppy drive, a Shugart 851, to the KryoFlux but when I attempt to create the preservation stream files, I receive a message like this, which I've attached to this post.

Can't create stream file
The streaming device reported missing index - no disk in drive
Read operation failed

Has anyone else encountered this problem before? I'm wondering if there might be a malfunction with one of the drive sensors.

Any help is greatly appreciated

Best,
Abby

Re: Shugart 851 error

Posted: Wed Jan 10, 2018 5:44 pm
by IFW
This can have various origins, but the net result is always that the index signal never gets asserted by the drive.
Some possible reasons:
- really no disk in drive
- the disk does not rotate properly (e.g. stuck in the jacket)
- index line is not connected/not working
- index sensor is not working
- the index signal is connected to a different pin than where it should be on a standard Shugart interface

Re: Shugart 851 error

Posted: Wed Jan 10, 2018 5:52 pm
by adamsabi
There is definitely a disk in the drive, and it is rotating so I think I can rule out the first two reasons. How would I determine whether the cause is due to one of the last three (index line, sensor, or signal)?

This is my first go at working with an 8" floppy drive, and I feel like I'm so close to getting it to work. Thanks for your help!

Re: Shugart 851 error

Posted: Wed Jan 10, 2018 5:56 pm
by IFW
If you can get an exact pinout for the drive, compare it with the pinout of the standard Shugart (PC) interface.
I am not sure whether your drive requires an adaptor to make it behave like a standard PC drive.
You can also check the signals getting asserted by a scope.

Re: Shugart 851 error

Posted: Wed Jan 10, 2018 5:57 pm
by IFW
You could also try replacing the cable, just in case.