The HP 375872-B21 is not like most other SAS hard disk drives, it has a higher capacity, i.e. 146 GB. This feature combined with the 300 MB/s transfer rate ensures that the HP 375872-B21 is noticed. The 375872-B21 is ideal for use with website database management or backups due to its quick transfer rate and middle order capacity. The 375872-B21 is mostly used in servers like HP ProLiant servers. The 375872-B21 like most simple IDE or SATA hard disk drives has a 3.5” form factor.