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blanc
14th October 2009, 03:54 PM
I have a hard drive with bad blocks. Are there any apps that can do a surface scan and repair/mark as bad the dud sectors? To my surprise neither DiskWarrior nor Drive Genius do this.

I found an app called SpeedTools but the company appears to have abandoned their web site.

ClockWork
14th October 2009, 04:48 PM
Nuh. More than 2 bad blocks and one needs a new Hard Drive.

AddIt: "Sometimes" if you erase the Hard Drive using Zero All Data, and then reinstall the OS, they'll vanish.

cgollner
14th October 2009, 05:15 PM
Spinrite. Home of Gibson Research Corporation (http://www.grc.com)

You'll need to connect the hard drive to a windows computer cause the software uses BIOS to access the hard drive. It has done wonders with numerous hard drives at work.

JimWOz
14th October 2009, 05:44 PM
Like Clockwork says, if you zero out the disk during a format in Disk Utility, it finds and locks out the bad blocks.
TechTool Pro also finds them when you do a surface scan, but you need to need to need to reinitialize using zero out data to lock them out. The TTP manual recommends running a surface scan a few times regularly after bad blocks are fixed, to ensure the drive media is not generally failing.