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1. Will Western Digital model JD drives operate correctly in a RAID array?
ANS: Adaptec RAID cards have been seen not to work with Western Digital's JD type drives. These are drive models that end in the letters JD.

The JD model drives have an error recovery feature that retries a read or write operation if it initially fails. In a RAID array, this can cause the RAID controller to time-out while waiting for the drive to respond. At that time, the drive would drop out of the array, causing potential data loss.

There are a few other models that are very "Raid friendly". The SD model drives, and most of the other "Enterprise" category drives have what is known as time-limited error recovery and it improves compatibility with RAID adapters; prevents drive fallout caused by the extended hard drive error-recovery processes common to desktop hard drives.
2, Have any SAS drives been found to be incompatible with Adaptec SAS RAID controllers?
ANS: Hitachi Ultrastar
73 GB HUS151473VLS300
147 GB HUS151414VLS300
We do not recommend their use on Adaptec SAS RAID controllers. This has been seen with Hitachi drive firmware versions A230 or A420.

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