4 Seagate 500GB hard disk RAID+1 array data recovery

Case:
A group of RAID+1 array of customers in computer city is composed of 4 Seagate /Seagate 500GB hard disk. Because the hard disk still has other hardware faults, the peers cannot exclude data recovery.,,

Solution:
According to the testing of the data recovery center, the 3 and No. 4 hard disks found that there were bodies damage and bad track failure.+1 Data recovery case.