How does TI handle newly formed bad sectors?

Discussion in 'Acronis True Image Product Line' started by peter49p, Mar 16, 2005.

Thread Status:
Not open for further replies.
  1. peter49p

    peter49p Registered Member

    Joined:
    Mar 16, 2005
    Posts:
    2
    A happy user of TI 8.0 here (on four XP systems). What would happen if a bad sector formed on a disk after it was imaged, when the attempt was made to restore the image? Would the bad sector be detected during the restore? Would the user have to run checkdisk to force the drive to remap the bad sector to a spare sector? And, most importantly of all, assuming the bad sector was successfully remapped to a spare one by the drive, would the restore then be successful? Would the sector in the image that went bad on the drive be redirected transparently to the spare sector during the restore?

    Many thanks for any information you can give on this question I've been wondering about for some time,
    --Pete
     
  2. feddup

    feddup Registered Member

    Joined:
    Oct 30, 2004
    Posts:
    160
    I'm relatively new to TI and would like to hear Acronis's answer to this as well. I typically run scandisk as part of the pre image cleanup but what if you went back a year or longer?
     
  3. MiniMax

    MiniMax Guest

    Interesting question indeed!

    * graps a chair, sits down, and eagerly waits for an answer *
     
  4. peter49p

    peter49p Registered Member

    Joined:
    Mar 16, 2005
    Posts:
    2
    On further thought

    Well, asking the question with other people listening has helped me to think this through better (as it often does.)

    Installing a TI image on a different disk works--that's one of the main reasons for imaging in the first place—to be able to reconstitute a system after the disk it's on crashes.

    Even a factory-new disk has bad sectors that have been remapped to spares, and it's not very likely that the remapping would be the same as the remapping on the disk that the image was made from.

    A disk with a newly formed bad sector is a different disk than the one the image was made from before the sector went bad, but an image can be installed to a different disk, so that shouldn't be a problem.

    The real question is this: when the image is made and reference is being made to a sector that has been remapped, what sector information is recorded in the image—the location of the spare sector, or the location of the bad sector? It must almost certainly be the location of the bad sector, which will remap transparently to the spare sector when the image is restored.

    In other words TI must deal in logical sector locations, not the physical ones on the drive. The drive maps the logical sectors to the real ones, sometimes remapping them to different physical locations to avoid bad physical sectors.

    Could someone who knows about these things in detail confirm all this?

    Many thanks,
    --Pete
     
Thread Status:
Not open for further replies.