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Scratch space is space on the hard disk drive that is dedicated for storage of temporary user data, by analogy of "scratch paper." [1] [2] It is unreliable by intention and has no backup. Scratch disks may occasionally be set to erase all data at regular intervals so that the disk space is left free for future use.
A head crash in a modern drive. Note circular scratch mark on the platter. A head crash. A head crash is a hard-disk failure that occurs when a read–write head of a hard disk drive makes contact with its rotating platter, slashing its surface and permanently damaging its magnetic media. It is most often caused by a sudden severe motion of the ...
In order to avoid the loss of data due to disk failure, common solutions include: Data backup, to allow restoration of data after a failure; Data scrubbing, to detect and repair latent corruption; Data redundancy, to allow systems to tolerate failures of individual drives
On Windows NT operating systems, CHKDSK can also check the disk surface for bad sectors and mark them (in MS-DOS 6.x and Windows 9x, this is a task done by Microsoft ScanDisk). The Windows Server version of CHKDSK is RAID-aware and can fully recover data in bad sectors of a disk in a RAID-1 or RAID-5 array if other disks in the set are intact. [11]
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In the compact disc system, ... (7.5 mm) that may be caused by minor scratches. ... Errors found in compact discs (CDs) are a combination of random and burst errors ...
Hard disk reader. A bad sector in computing is a disk sector on a disk storage unit that is unreadable. Upon taking damage, all information stored on that sector is lost. When a bad sector is found and marked, the operating system like Windows or Linux will skip it in the future.
Medium errors are most commonly detected by checking the read data against a checksum – itself being most commonly also stored on the same device. The mismatch of data to its supposed checksum is assumed to be caused by the data being corrupted .