Secondary storage

File compression.
- File compression is the process of condensing certain files to take up less space on a computer, disc or external storage device. Compression usually requires special formats and software, but there are many different versions available. Compressed files have to be expanded again to be used.

Head crash.
- A head crash is a hard-disk malfunction that is the result of the read-write head of the hard disk coming in contact with the rotating platter, causing probably permanent damage to the magnetic media on the platter surface.

Internet hard drive.
- It is known to solve the issue of data storage. The sole purpose of this is to access computer files from any computer as long as that computer has Internet access. Unlike your local hard drive, which may have a limited storage capacity, a competitive Internet hard drive provider will offer virtually unlimited disk space such as offered by LiveDrive.com.

Optical disc drive.
- Optical drives retrieve and/or store data on optical discs like CDs, DVDs, and BDs (Blu-ray discs) which hold much more information than classic portable media options like the floppy disc. Most optical drives can play and/or record onto a large number of different disc formats. Popular formats include CD-ROM, CD-R, CD-RW, DVD, DVD-RAM, DVD-R, DVD+R, DVD-RW, DVD+RW, DVD-R DL, DVD+R DL, BD-R, and BD-RE.

Solid-state storage.
- Solid-state storage is a nonvolatile, removable storage medium that employs integrated circuits (ICs) rather than magnetic or optical media. It is the equivalent of large-capacity, non-volatile memory. The main advantage of solid-state storage is the fact that it contains no mechanical parts. Everything is done electronically. As a result, data transfer to and from solid-state storage media takes place at a much higher speed than is possible with electromechanical disk drives.