On 13-06-23 03:00 PM, Pavel Machek wrote: > > 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?) For ATA, use the "logical sector size". For all existing drives out there, that's a 512 byte unit. > ...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? No, it works just fine. You probably have more than one bad sector. After you see a read failure, run "smartctl -a" and look at the error logs to see what sector the drive is choking on. Or just low-level format it all with "hdparm --security-erase". Cheers -- Mark Lord Real-Time Remedies Inc. mlord@xxxxxxxxx -- 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
