Secondary Storage

File Compression
File compression is a technique used in decreasing the size of a single or a bunch of files. File compression is useful because it helps reduce the consumption of space and thus easier storage or transfer of files. It also saves users from using too much bandwidth or expensive storage space to store big files.

An example of file compressor.

Head Crash
A head crash is a hard-disk failure that occurs when the head of a hard-disk drive touches its rotating platter, resulting in permanent and usually fatal damage to the hard-disk. This usually happens when the hard-disk receives a very huge impact causing the head to shake and touch the platter.

A damaged Hard-disk

Internet Hard Drive
Like a hard-disk, a Internet hard drive helps you store your computer files on the Internet and access them from any location as long as you have Internet connection. They are very low-cost and some of the storage sites even offers free storage. The downside is that information stored on the net are exposed to low-privacy and can be easily hacked, uploading also takes a lot of time too if the connection is slow.

Optical Disc Drive (ODD)
An ODD is a disc drive that uses laser light or electromagnetic waves to receive and store data on an optical disc. There drives are both readers and recorders so it can read retrieve and store data to or from Compact discs, DVDs and Blue-ray discs.

An ODD.

Solid-state Storage
Solid-state storage (Or Solid-state drive, SSD) is a data storage device that stores data using solid state memory. SSDs use microchips which retain data in non volatile memory chips. SDDs are usually less prone to physical shock, quieter and have lower access time and latency. They use the same interface as hard disc drives.