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Repairs on Dynamic disks
ByteBack D.R.I.S.TM supports recovery of volumes on Dynamic Disks to some extend:
- Only simple volumes that do not span multiple disks and/or 'segments', can be recovered.
- Disks that were upgraded from a Basic disk to a Dynamic disk
can be recovered by recreating a complete basic partition table layout (the
disk will become a Basic disk again).
- On disks that were
Dynamic from the start, 4 volumes (the maximum number of allowed primary
partitions) can be recovered as basic primary
partitions. If more then 4 volumes were present and need to be recovered,
you must: recover the first 4 as primary partitions / copy the data from
these partitions to a safe place / recover the next 4 partitions / copy the
data to a safe place / etc.
- ByteBack D.R.I.S.TM can also automatically
make corrections to the 'legacy' partition table if an intact LDM is present, in
case the legacy partition table entry for the Dynamic Disk (a type 42h) was
deleted or corrupted.
Depending on the scenario, the disk may remain a Dynamic disk, or will
become a Basic disk after repairs have been made:
| Scenario |
Options |
Disk type after repairs |
| An LDM was found but NO type 42h partition. |
If you select 'yes' ByteBack D.R.I.S.TM will create a type 42h
partition. |
Dynamic
Disk |
| If you select 'no' a partition list is displayed from which
individual partitions can be selected for recovery. |
Basic
Disk |
| An LDM was found and a type 42h partition IS present. |
To recover individual partitions, select
'yes' when asked to continue
repairs. |
Basic
Disk |
| On a Dynamic disk no LDM is detected (for example if the LDM
is corrupt). |
To recover individual partitions follow the standard
procedure (no prompts will appear). |
Basic
Disk |
ByteBack D.R.I.S.TM may issue several prompts when evidence is found that the disk was at
one time a Dynamic Disk:
-
If ByteBack D.R.I.S.TM finds a LDM but no type 42h partition in the
legacy partition table, the following prompt is displayed:
|
The LDM DataBase was found on disk
(DiskNo.).
but no Partition Table Entry was found.
Do you wish to create a Partition Table Entry for a
Dynamic Disk? |
ByteBack D.R.I.S.TM will display this prompt if an LDM appears to be present while no
type 42h partition is defined in the legacy partition table (in the Windows
Disk Management applet the disk appears to be empty). If you answer yes,
ByteBack D.R.I.S.TM will create a correct type 42h partition table entry. You should
now discontinue the repairs, reboot and verify if the individual volumes on
the Dynamic Disk can be accessed.
-
When both a type 42h partition and
a LDM are found,
ByteBack D.R.I.S.TM will display the following prompt:
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A Dynamic Disk was found on disk
(DiskNo.).
Continuing the repair of individual partitions will delete
the Dynamic Disk.
Do you wish to continue? |
As a disk is either Dynamic or Basic, continuing and creating entries for
individual partitions in the (legacy) partition table will 'convert' the
disk (back) to 'Basic'. ByteBack D.R.I.S.TM will remove the entry for the type 42h
partition and create a maximum of 4 primary partition entries (see the table
at the top for details). ByteBack D.R.I.S.TM does NOT remove the LDM DataBase; when ByteBack D.R.I.S.TM
is run again at a later time it
will detect the LDM DataBase and display the appropriate prompts.
If you wish to continue you
can now follow the 'normal' steps for recovering individual partitions.
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