SUMMARY:Hitachi DK516C-16

From: Robert Kuhn (
Date: Fri Sep 20 1991 - 12:00:00 CDT

>I have had bought for my system a Hitachi DK516C-16, a 1.33Gbyte (formatted)
>drive. We've had a number of problems with the drive, most of which have
>been resolved by replacing the SCSI terminator, putting in the patch
>for big disks, ....
>Here is the remaining problem. Whenever I try to write a disk label,
>or a defect list to the drive I get the following error message.
>Fatal non-media error(illegal request)
>Block 2621604 (xxxx/yy/zz)
>where the cylinder, head & track numbers correspond to that block.
>Now the error is the same (same block number) on a replacement disk.

Well, as most people pointed outt, my problem was reading the manual --
i.e. I did so, rather than ignoring it! The accompanying Hitachi
documentation claims the disk has physically 2179 cylinders, of
which 7 are reserved for various bits and pieces. It also says the
default is 81 tracks, 15 heads. That gives a grand total of
2638980 blocks available. The disk only has 2621604 blocks.

One might think that reducing pcyl, and ncyl to bring the number
of blocks down below the real number would work, but, as far as
I can tell, that ain't so. All the replies from people with
these disks suggested using pretty much the following:

disk_type = "Hitachi DK516C" \
        : ctlr = MD21 : fmt_time = 4 \
        : ncyl = 2170 : acyl = 2 : pcyl = 2172 : nhead = 15 : nsect = 80 \
        : rpm = 3600

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