Disk caching
Caching is space.Disk cache is a mechanism for improving the time it takes to read from or write to a hard disk.Now,the disk caching usually inclide as part of the hard disk.It can also be a specified portion of random access memory (RAM).The disk cache holds data that has recently been read and in some cases,adjacent data areas that are likely to br accessed next.Write caching is also provided with some disk caches.
Redundant arrays of inexpensive disks (RAID)
RAID is a way of storing the same data in different places on multiple.It is the organization of multiple disks into a large,high performance logical disk.It also a technology that allowed computer user to achieve high levels of storage reliability from low-cost and less reliable PC-class disk-driver components,via the technique of arranging the devices into arrays for redundancy.
File compression and decompression
The NTFS file volumes support file compression on an individual file basic.The file compression algorithm used by the NTFS file system is Lempel-Ziv compression.This is a lossless compression algorithm,which means that no data is lost when compressing anf decompressing the file, as opposed to lossy compression algorithms such as JPEG,where some data is lost each time data compression and decompression occur.
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