My best guess as to the reason for this bug is that the kernel
identifies some disks as "SEMB devices", whatever those are. See
drivers/ata/libata-core.c, function ata_dev_classify (line 1082 in
2.6.27):
if ((tf->lbam == 0x3c) && (tf->lbah == 0xc3)) {
printk(KERN_INFO "ata: SEMB device ignored (lbam=0x%lx
lbah=0x%lx\n", (unsigned long) tf->lbam, (unsigned long) tf->lbah);
return ATA_DEV_SEMB_UNSUP; /* not yet */
}
I modified the printk to report the values (as shown above), and got the
values lbam=0x3c and lbah=0xc3. I have no idea what those mean, but
maybe they're helpful.
--
kernel does not recognize Western Digital Caviar SE WD3200AAJS 320GB 7200 RPM
SATA 3.0Gb/s Hard Drive (2nd generation)
https://bugs.launchpad.net/bugs/257790
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