Secondary Storage

Disk Caching

Disk cache is a mechanism for improving the time it takes to read from or write to a hard disk. Nowadays, the disk cache is usually included as part of the hard disk. A disk cache can also be a specified portion of random access memory (RAM). A portion of RAM used to speed up access to data on a disk.

Redundant Arrays of Inexpensive Disks(RAID)

RAID is a way of storing the same data in different places on multiple hard disks. It is also a technology that allowed computer users to achieve high levels of storage reliability from low-cost and less reliable PC-class disk-drive components, via the technique of arranging the devices into arrays for redundancy. When data is placing on multiple disks, input and output operations can overlap in a balance way. Besides that, it also can improve performance.

File Compression and Decompression