I own a WD 750GB drive as a backup drive for my data. Recently the MBR of the drive and partition table were messed up and my drive is not recognized by the OS (Win & Ultimate x64) anymore. I'm using HDD LLFT to reformat the drive as I have already backed up all my files and folders to try to restore the drive to its working condition, if that helps.

HDD LLFT reports this:

"Current date and time: 7/22/2014 1:48:18 PM
HDD Low Level Format Tool 4.40; http://hddguru.com
Device details for [1] WDC WD75 01AALS-00E3A 05.0 [750.15 GB] (1465149168 512-byte sectors)

Details are unavailable: Internal error.
Please post this problem on http://forum.hddguru.com"

According to this log, may it be that my HDD is defective (hardware issue)? Should I consider to RMA this drive if the warning is smth. serious?
Please, I need some opinion/advice on this issue, and how to fix it.
Thank you

If Western Digital's Data LifeGuard (DOS version) utility fails your drive, then I would replace it.

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A backup a day keeps DR away.

You are running the program as an administrator right??? (I would assume it only runs that way)

If not windows could be blocking your from wiping the partition table.

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Data Medics - Hard Drive, SSD, and RAID Data Recovery Service Company

Try a program like Active KillDisk. If you can run a zero fill pass, the drive is good. If it fails, RMA it.

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Data Medics - Hard Drive, SSD, and RAID Data Recovery Service Company

+ data-medics.

Active KillDisk is a good way to know if drive is badly