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doswarn.310
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1985-10-09
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IBM Dealers' Hotline Problem # DLE-850009
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This problem occurs when using DOS 3.1 on a non-AT (ie AT intelligent
controller) with a hard disk. It is relatively rare, but if conditions
are right, let's hope that you just backed up your hard disk. If you
haven't, you'll wish that you had!
The problem is as follows:
Whenever a disk drive that is not on an AT disk controller card has an error
that goes through ECC (Error Correction Code) under DOS 3.1, the data on that
disk is garbled on all subsequent sectors. This problem occurs on all non-AT
systems, including IBM's XT (with the IBM disk controller).
One example (I am told) of this type of error is a DMA boundry error.
Apparently, these errors are not too common, but certain code is able to force
this error 100% of the time and thus demonstrate the problem. To keep it from
being misused by the less responsible among us, that code should not be
published.
Because of this problem, I am not installing DOS 3.1 until IBM has a
fix....