Logicube Omniclone Xi user manual Reference, Defragment

REFERENCE

A method of checking for errors in data transmitted from one device to another, e.g. from one hard drive to another. With CRC the sending device applies a 16- or 32-bit polynomial to a block of data to be transmitted and then appends the result to the block. The receiving device applies the same polynomial to the data block and compares that result with the original. If the two values agree, then the data has been transmitted without error. If the values don’t match, then the sender is notified to resend the block of data.

CRC ensures detection of 99.998% of all possible errors.

Defragment

The process of taking noncontiguous fragments of a data file stored on a hard drive and rearranging them into one contiguous group, resulting in reduced data access times and more efficient use of hard drive space.

Fragmentation occurs naturally over time as files are created, deleted, and modified. Some operating systems come with a utility for defragmenting drives. Third party defragment utilities are also available.

DMA (Direct Memory Access)

A method of transferring data from one computer device to another directly through main memory without passing it through the CPU.

EIDE (Enhanced Integrated Drive Electronics)

Ahigh-speed electronic interface used for transferring data between a computer and the computer's hard drive. The theoretical maximum IDE transfer rate is 16.6 MB/sec depending on the hard drive speed, the transfer mode and the operating system.

FAT (File Allocation Table)

A table that an operating system uses to locate data stored on a hard drive. The FAT system for DOS

4.0and above, and for older versions of Windows 95 is called FAT16. The FAT table for Windows 95 OSR2 or newer, Windows 98 and Windows ME is called FAT32. FAT16 allows for a maximum of

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