Messages in this thread | | | Date | Tue, 30 Mar 2004 17:22:50 +0200 (MEST) | From | Geert Uytterhoeven <> | Subject | [PATCH] Bogus LBA48 drives |
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Apparently some IDE drives (e.g. a pile of 80 GB ST380020ACE drives I have access to) advertise to support LBA48, but don't, causing kernels that support LBA48 (i.e. anything newer than 2.4.18, including 2.4.25 and 2.6.4) to fail on them. Older kernels (including 2.2.20 on the Debian woody CDs) work fine.
One problem with those drives is that the lba_capacity_2 field in their drive identification is set to 0, making the IDE driver think the disk is 0 bytes large. At first I tried modifying the driver to use lba_capacity if lba_capacity_2 is set to 0, but this caused disk errors. So it looks like those drives don't support the increased transfer size of LBA48 neither.
I added a workaround for these drives to both 2.4.25 and 2.6.4. I'll send patches in follow-up emails.
BTW, this problem (incl. a small patch to fix it for 2.4.19, which doesn't work on 2.4.25 anymore) was reported a while ago by JunHyeok Heo, cfr. http://www.cs.helsinki.fi/linux/linux-kernel/2002-42/0312.html
Gr{oetje,eeting}s,
Geert
-- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
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