recently i bought a buffalo terrastation 2 and upgraded the 500gb disks to terabytes.

i bought 4 from aria and managed to format them, however when building the raid 5 array the system reported an error on disk 4. i reformatted the drive and attempted to build the array again however i got the same message.

i rma'd the drive however they have just replied to me saying there has been no fault found and they cannot refund or replace.

i advised them how i discovered the error and they agreed to test it again, however im sceptial they will find a problem now.

can anyone offer advice?