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RAID 0 (Striping)

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RAID 0 provides capacity and speed but not redundancy (so it is AID rather than RAID). Data is striped across the drives with all of the performance benefits that gives, but if one drive fails the RAID is dead just as if a single hard disk drive fails.

This is good for transient storage where performance matters but the data is either non-critical or a copy is also kept elsewhere. Other RAID levels are more suited for critical systems where backups might not be up-to-the-minute, or down-time is undesirable. Some "nested" RAID levels combine RAID 0 with other RAID levels to give a level of fault tolerance.

RAID 0 Data Recovery

The RAID 0 data recovery process involves the securing of all available data from the working disks, then whatever hardware work is required to get the available sectors from the failed disk(s). The lack of any parity (error correction) data means that there is no opportunity for the missing data to be rebuild as part of the RAID 0 data recovery process.

Failed Sectors

The incidence of failed sectors within a RAID0 array, usually the result of faults within the recorded surface or contact between the hard drive read/write heads and platter, have the same effect as with a single hard disk. There is no capability to rebuild the data from any missing sector and so the success of the data recovery process is determined by from where in the file system the data has been lost and how effective the recovery process is in working around the loss. If there is data loss within a file then, if that file is required, an recovery technique needs to be able to understand the data format and be able to work around the problem. With some types of files this is not an option. Other data loss might cause problems within the file system, for example the loss of the allocation bitmap for the MFT in a Windows NTFS file system. This, whilst serious, can be corrected for in the data recovery procedure.

Failed Disks

Where a disk has failed completely then the RAID data recovery procedure must deal with the hardware, with one disk missing from a RAID0 there are evenly spaced gaps throughout the entire volume which will result in significant data corruption and, in most cases, loss of the required data. Unless the failed disks has significant head-crash damage it is usually practicable to recover data from the hard drive, and if this physical recovery work is 100% then the RAID data recovery will be 100%

As with any RAID or hard disk drive, is it advisable to seek expert advice before attempting any action of your own to recover data. A professional data recovery service will first secure all available data from the disks in the RAID to ensure that the problem can not be made worse by an recovery efforts, before then embarking upon the data recovery work.

Last Updated (Wednesday, 22 July 2009 09:13)

 
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