![]() ![]() ![]() This is the number of bad sector's which the drive has remapped. registers for your drive with a tool like SMARTReporter, you should see an entry with ID number 05 and title "Reallocated Sectors Count". I don't know when it started but some time back the ability to remap a bad sector was merged into the firmware of the hard drive. I doubt you will find any software tools to "fix" bad blocks, at least for recent hardware. What type of a Mac and what type of hard drive are you having problems with? I don't know of any tool that will do a surface scan and fix the bad blocks too. Since you're using Mac OS X, which is based on BSD, you might also want to read up on badsect and bad144, which are the built-in BSD command-line utilities for dealing with bad blocks. You can get a list of all hard disks (/dev/sdX devices) by typing this command: sudo fdisk -l If you have more than one hard drive, you can replace /dev/sda with /dev/sdX, where X is lowercase letter. This will do a non-destructive random read-write test on the first drive, remapping bad sectors along the way. ![]() The easiest way to force the drive to do its own bad block remapping is to boot from an Ubuntu Live CD, then open a terminal and run this command: sudo badblocks -nvs /dev/sda (Note: make sure to backup your data first!) If the SMART diagnostics are reporting no reallocated sectors (or if the VALUE column for "Reallocated Sector Count" is still well below THRESHOLD), there is an easy way to perform a surface scan and remap the bad blocks at the same time. I'd suggest downloading smartmontools and GSmartControl to view the SMART diagnostics as another check, if you aren't sure which SMART diagnostics to trust. You should backup your data immediately (if you haven't already) and replace the drive before the problem gets worse and you lose your data. If you're seeing bad blocks when you run a filesystem integrity check, the hard drive has most likely already exceeded the number of blocks it can remap, and has exhausted its "spare" sectors. ![]()
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