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sometimes at your workplace. You tend to become incapable and powerless when
you are unable to access data with a click.
Data on a RAID array or volume can becomes inaccessible due to any of the
following reasons: a faulty RAID controller; multiple hard drive crash;
malfunctioning upgrade or faulty striping; defects with the MFT mount points;
RAID controller failure or configuration changed; adding incompatible hard
drives; hardware conflicts; hardware conflicts; software corruption; virus
infection and software and operating system upgrades etc.
In these above conditions, the following steps should be taken immediately to
increase chances of getting critical files back:
Shutdown the server and turn off the system. Do not try to reboot again. This
may cause serious damage to your hard drive.
Do not attempt to recover data by yourself, friends or PC repair shops. This
may result in permanent loss.
Do not continue to attempt a forced rebuild if you have already replaced a
failed drive and tried to rebuild the array, but still can't access your
data. This may wipe out your data. RAID data recovery utilities and software
are not designed to restore data or rebuild RAID arrays from failing hard
drives. This requires specialized equipment and professional training.
Swapping hard drives or re-ordering drives in a multiple drive RAID array may
cause overwriting the striping and parity.
This makes it nearly difficult to reconstruct your RAID array and salvage
your company's vital data.
Seeking professional help from professionally trained data recovery engineers
is the sanest solution. Most data can be recovered from crashed hard drives
and malfunctioning RAID servers by these experts only.
Professional data recovery engineers have specialized equipment, a thorough
knowledge of hex, drive structures, MFT mount points and offsets.
The Professional engineers' initial diagnosis determines whether each media
device is accessible to their lab equipment. From all the data accessible to
them from each media, they make a raw image onto a new media to help them
analyse and assess the data loss. If some of the media is difficult to get
hold of, they will test the components and closely check its internal
condition to assess the level of physical damage sustained. The damaged
components include electronics, read/write heads, magnets, drive motors and
head assemblies.
The raw images of the entire server's media are used for logical recovery by
examining the low-level data sectors. Determination of both the exact layout
of volumes, which span or are striped across multiple drives, is a must.
Necessary fixes to the file system structures are to be decided upon to get
access to important data.
Servers that work on multiple drives are usually "destriped" onto a different
media so that file system repairs can be done and the data files retrieved.
It may be necessary to extract data directly from one or more fragments of
the destriped image.
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