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When I place the drive into an external enclosure, Linux Mint “Disks” application states that the drive is only 4GB, but it's a 2TB hard drive.

Disks also reports “Disk is OK, one bad sector.”

Any thoughts on data recovery, and why it things the drive is only 4GB?

The drives came out of my NAS when it became disfuctional.
The drives are "Seagate Barracuda ST2000DM001 2TB 64MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Bare Drive".
The drives have been working for about a year, but now my RAID 1 mirrored drives are both unreadable, with similar symptoms

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    Does the enclosure support 4TB disks? – Ramhound Nov 15 '14 at 18:41
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    Is the enclosure really old? – Shane Di Dona Nov 15 '14 at 18:42
  • The hard drives are only 2TB, and the enclosure supports up to 3TB. – cjtightpant Nov 15 '14 at 18:42
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    @ShaneDiDona nope, I bought it this week. The same behaviour happened when I plugged directly into my motherboard. – cjtightpant Nov 15 '14 at 18:43
  • @Psycogeek, I'll try and elaborate. The drives came out of my NAS when it became disfuctional. The drives are "Seagate Barracuda ST2000DM001 2TB 64MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive Bare Drive". The drives have been working for about a year, but now my RAID 1 mirrored drives are both unreadable, with similar symptoms. – cjtightpant Nov 15 '14 at 19:38
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In my experience, the vast majority of commonly available external enclosures—unless specified otherwise—can only handle a single drive with a size of 2TB (max) or lower.

When I attempted to place a 3TB drive into a 2TB enclosure it would only show 800GB available.

Any thoughts on data recovery…

If the drive has data on it already and you simply cannot read it via the external enclosure, no need to worry about data recovery. Chances are the enclosure itself is the issue. Meaning if you get an enclosure that can truly handle drives larger than 2TB you should be fine.

That said, many 2TB or higher enclosures are “weird” as in they operate on their own logic to access data to a connected drive. Meaning the trick of taking one SATA drive connected to a system one way and then hooking it up to an enclosure isn’t always guaranteed to work.

If the drive is new and just needs to be formatted, then don’t worry. Get an appropriate enclosure, stick the drive in and it should be good to go after a partitioning and formatting.

As far as the Linux aspect of this goes, on the offhand chance this is a system issue, then—as explained on this site—you need to make sure the Linux kernel is 2.6.x or higher, the kernel must be compiled with CONFIG_LBD enabled and the drive should be partitioned with GPT (GUID partition tables) partition tables.

  • Thanks for the feedback, @JakeGould. To remove the enclosure from the equation, I've plugged the drive directly into my motherboard, and the same problem occurs, unfortunately. My primary concern at this point is to recover my data. Hopefully ddrescue provides some results. – cjtightpant Nov 15 '14 at 19:34

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