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I have a Seagate NAS 440 8TB system and it has 4 2 TB drive in it. I'm sure I have a bad drive.

My problem is I have the bad drive out of the system, I don't have my old box we moved last year. When I had the problem it look like drive 2 was blinking so I shut it down and reseated it an it work fine for weeks. I took it into the office with me and called Seagate and paid them for nothing. While on the phone with her she had me swap some of my drives around to try and correct the issue. I have three good drives in the unit and have test them and they show okay, but not raid5. The are showing usage and size unknown. If I go to the VOL. tab there are in 2, 3 an 4 and show raid5 failed and the only thing I can do is delete the raid 5. If I call Seagate should the be able to tell me what S/N of the drive came in what bay. Or should I just keep moving them around? Thanks.. Tony
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    The 440 uses Linux software RAID aka mdadm. You can examine the RAID meta data which will tell you the drive order termed "Device Role" among other things.

    So connect the drives to a Linux box and run the command: mdadm --examine /dev/sd?4

    Here is an example of what you should see. This is from my notes on a recent remote data recovery case I worked on....

    mdadm --examine /dev/sda4

    Magic : a92b4efc
    Version : 1.2
    Feature Map : 0x0
    Array UUID : 43174142:37ec1d20:ff994d8b:52c40635
    Name : 3
    Creation Time : Wed Mar 6 07:34:03 2013
    Raid Level : raid5
    Raid Devices : 4

    Avail Dev Size : 1947911838 (928.84 GiB 997.33 GB)
    Array Size : 5843735424 (2786.51 GiB 2991.99 GB)
    Used Dev Size : 1947911808 (928.84 GiB 997.33 GB)
    Data Offset : 272 sectors
    Super Offset : 8 sectors
    State : clean
    Device UUID : 62bb6105:84c26a9a:57d103c1:1bd9e63c

    Update Time : Wed Feb 19 18:21:32 2014
    Checksum : f631f988 - correct
    Events : 2926674

    Layout : left-symmetric
    Chunk Size : 64K

    Device Role : Active device 2
    Array State : AAAA ('A' == active, '.' == missing)
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