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  1.    16 Dec 2015 #11
    Join Date : Aug 2015
    Posts : 369
    Windows 10 Pro

    Quote Originally Posted by SkylineW10 View Post
    W10 did not throw up a warning about encountering a RAID configuration.
    What kind of "RAID configuration" are we talking about here?

    Did you use your motherboard/chipset features to create a RAID array? Or did you use Windows drive mirroring features for that purpose?
      My ComputerSystem Spec
  2.    17 Dec 2015 #12
    Join Date : Aug 2015
    Warwickshire, England
    Posts : 18
    Windows 10
    Thread Starter

    When I bought the PC from Scan UK I accepted their suggestion have a RAID configuration, so I'm afraid I don't know the answer to that. Would the boot up screens tell me that?
      My ComputerSystem Spec
  3.    17 Dec 2015 #13

    Account closed as requested
    Join Date : Dec 2015
    Posts : 72
    Windows 10 Home x64 v1511, many others virtualized

    A little bit confusing: RAID1 (mirror set) consists of two physical disks, but operating system sees it as only one disk. A proper device driver is responsible for writing the same data to both physical disks, so if one of them fails, all data are still accessible on second disk.

    If you have one partition created on RAID array, then you will see it as one and only one drive (for example E:). Under common circumstances, you cannot access physical disks in RAID1 array separately. This is necessary to avoid data inconsistency; both physical disks have to contain the same data.

    So it is strange to have two drive letters D: and E: for the same partition on the mirror set. It can be done using a registry hack; however it should not be necessary. You can try to redirect pagefile to C: drive, restart, then change drive letter of your mirrored partition to E: and test your applications. Changing drive letter has no effect on data, the partition itself and its content remains intact.

    Furthermore, usually there is some application (Marvell, Intel, SiliconImage etc) for monitoring health of RAID arrays; if you have one, you may easily discover if array is inconsistent or if it contains failed physical disk. Then you may rebuild the array or replace the failed physical disk and then rebuild RAID1 array without loss of data.

    Click image for larger version. 

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    Last edited by valihrach; 17 Dec 2015 at 10:39.
      My ComputerSystem Spec
  4.    19 Dec 2015 #14
    Join Date : Aug 2015
    Warwickshire, England
    Posts : 18
    Windows 10
    Thread Starter

    After my visit to a repair shop:-

    It turns out that there were three hard drives in addition to my OS SSD. One was D: (my active data), a second is RAID configured (not visible in Windows 'My Computer' as it is reserved for RAID if D: fails); and disk three E: another data disk.
    E: had died. I Iost some stuff but not important enough to warrant paying 00s for specialist recovery. I replaced E: with a 1TB cannibalised from a PC I'm not using.
    All's well that ends, kind of well.

    Many thanks for all the posts.
      My ComputerSystem Spec

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