Re: Offline uncorrectable sectors

https://www.smartmontools.org/browser/trunk/www/badblockhowto.xml This will help you figure out what data is in the bad sector, and whether it's important or replaceable from a backup. Note that this is an AF drive, specifically 512e variety. 512 bytes logical sector, 4096 bytes physical sector. To erase, you have to do a 4KiB write. If you do a 512 byte write, or 8 512 byte writes, the drive will likely do read,modify,write which will fail at read and you'll get a read error from the drive even though you're writing. This is of course confusing. So if you use dd to do the overwrite, bs=4096 and then you have to adjust the seek= value since it too will be based on 4096 bytes; whereas LBA for a 512e drive is based on 512 byte sectors. So yeah, make sure you get it right or you'll zero some other sector. Make sure count=1 to avoid a mess... hdparm has a way to do this also but I haven't used it, so I'm not sure how the whole 512 vs 4096 thing gets sorted out. --- Chris Murphy