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How to test SATA hd for bad sectors?

Hello,
I bought a pair of WD R3 750Gb hard-drives and my RAID1 array fell apart/became inaccessible due to the fact that hard-drives were 'bad' - according to my computer. I suppose either just one of them, or both have bad sectors.

Is there a software that can scan and test SATA hard-drives for bad sectors or overall reliability? I know of a bunch of IDE hd testers, but none for SATA.

Pleas recommend.

Thanks in advance!
Storage Hardware

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Storage Hardware
Storage Hardware

Storage devices include any device used for storing and retrieving digital information. Hard disk drives (HDDs) use one or more rigid ("hard") rapidly rotating disks (platters) coated with magnetic material. Data is accessed in a random-access manner, meaning that individual blocks of data can be stored or retrieved in any order and not only sequentially. The primary competing technology for secondary storage is flash memory in the form of solid-state drives (SSDs), but HDDs remain the dominant medium for secondary storage due to advantages in price per bit and per-device recording capacity. CD-RW (Compact Disc-ReWritable) is a digital optical disc storage format that allows information to be stored outside the mechanical HDD.

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