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"most of bad secter error"
Test the hard drive with the SeaTools program's long test, or another hard drive diagnostics program provided by the brand of the specific hard drive on their web site.
(Toshiba drives have no diagnostics program available on the Toshiba web site).
Regarding the SeaTools program specifically -
If the drive has a relatively small number of bad sectors (LBA errors), 99 or fewer, the long test will complete, and you will probably be offered the option of zero filling the drive to possibly correct the problem.
- if the drive is not a Seagate or Maxtor drive, it's recommended you use the hard drive diagnostics program provided by the brand of the hard drive on their web site to test the drive using it's long test, then zero fill (or "low level format" - that does the same thing) the drive.
- zero filling the drive deletes ALL the data that's already on the drive. If you have personal data you don't want to lose, you must copy it to elsewhere BEFORE you zero fill the drive. If Windows is on the problem drive , if you have only one Windows installation on the computer, and you can't get Windows to work properly, you need to either
- connect the problem drive to another computer that has a working operating system such that you're not booting from the problem drive
- or - boot your computer with something such as a bootable Linux CD
and copy the files you don't want to lose to elsewhere.
If the SeaTools long test finds more than 99 LBA errors, the test will quit at that point, because it's probably not going to help to zero fill the drive - the drive will probably rapidly develop more bad sectors.
If you have personal data you don't want to lose, you must copy it to elsewhere - you could try doing the things suggested above, but if you can't access the hard drive, you can't copy any data off of it yourself - the only way to get data off of it is for you to pay considerable money to have an expert do that, or for you to do the same thing the expert will do - replace the board on the drive with one that's compatible with the drive, or transfer the disk(s) (platter(s)) inside the drive to another drive the disk(s) is(are) compatible with. The problem hard drive must show up as being detected properly in the computer's bios .
You will probably need a Windows DVD, or the Recovery disk(s) that came with the computer when it was new (most Dell models that come with XP on them come with those - an XP Re-installation CD, and another disk with drivers and applications on it - that may not apply if the model originally had Vista or Windows 7 on it), in order to be able to install Windows on a replacement hard drive.