Hi! > > ...Ok, lets try with dd. > > > > root@amd:~# dd if=/dev/sda4 of=/dev/zero bs=1 skip=8958947328 > > dd: reading `/dev/sda4': Input/output error > > 0+0 records in > > 0+0 records out > > 0 bytes (0 B) copied, 5.05805 s, 0.0 kB/s > > I once noticed a similar problem. The trouble is that the kernel > always seems to be doing a larger read access that failes for this > sector, and the write is never executed. And returns success writing? That's pretty antisocial :-(. > You can try: hdparam --write-sector 961237188 /dev/sda Thanks for the hint. (Insert rant about hdparm documentation explaining that it is bad idea, but not telling me _why_ is it bad idea. Can I expect cache consistency issues after that, or is it just simple "you are writing to the disk without any checks"? Plus, I guess documentation should mention what sector number is. I guess sectors are 512bytes for the old drives, but is it 512 or 4096 for new drives?) ...but it does not do the trick :-(. It behaves strangely as if it was still cached somewhere. Do I need to turn off the write back cache? root@amd:~# hdparm --yes-i-know-what-i-am-doing --read-sector read-sector: bad/missing sector value root@amd:~# hdparm --yes-i-know-what-i-am-doing --read-sector 961237188 /dev/sda /dev/sda: reading sector 961237188: FAILED: Input/output error root@amd:~# hdparm --yes-i-know-what-i-am-doing --write-sector 961237188 /dev/sda /dev/sda: re-writing sector 961237188: succeeded root@amd:~# hdparm --yes-i-know-what-i-am-doing --read-sector 961237188 /dev/sda | uniq /dev/sda: reading sector 961237188: succeeded 0000 0000 0000 0000 0000 0000 0000 0000 root@amd:~# sleep 10 root@amd:~# hdparm --yes-i-know-what-i-am-doing --read-sector 961237188 /dev/sda | uniq /dev/sda: reading sector 961237188: succeeded 0000 0000 0000 0000 0000 0000 0000 0000 root@amd:~# sync root@amd:~# hdparm --yes-i-know-what-i-am-doing --read-sector 961237188 /dev/sda | uniq /dev/sda: reading sector 961237188: succeeded 0000 0000 0000 0000 0000 0000 0000 0000 root@amd:~# dd if=/dev/sda4 of=/dev/zero bs=4096 skip=$[8958947328/4096] dd: reading `/dev/sda4': Input/output error 102+0 records in 102+0 records out 417792 bytes (418 kB) copied, 5.36697 s, 77.8 kB/s root@amd:~# hdparm --yes-i-know-what-i-am-doing --read-sector 961237188 /dev/sda | uniq /dev/sda: FAILED: Input/output error reading sector 961237188: root@amd:~# Thanks, Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
