Date: 12 Jun 1997 15:15:21 -0000 From: mark thompson <thompson@squirrel.tgsoft.com> To: hackers@freebsd.com Subject: floppy, redux Message-ID: <19970612151521.6346.qmail@squirrel.tgsoft.com>
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I wrote some time back about problems with my floppy... how it regularly writes and reads without reporting errors, but the data is incorrect. Well, i have now looked at it a bit more and the problem is not that the data is "wrong" (ie. the bits were written/read incorrectly), but that the data has been scrambled (little strings of otherwise "correct" data written in the wrong places in the file). It appears that the data which has moved to the wrong places is "near" to where it should be, implying that it was probably part of a single write/read. This scrambling appears to occur on both reads and writes, since the data on the disk is wrong, and the data that i read back is more wrong. For other reasons, i have replaced the floppy cable. The drive itself would seem innocent, since it pretty much is just a record/playback device. The floppy controller/DMA unit comes in for suspicion. Unfortunately, this started shortly after going to 2.2.1 from 2.1.7, so i also suspect the driver. I am hoping that all of this will suggest something to one of the experts out there, because otherwise i fear it will be mondo difficult to track down. -mark
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