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This category revolves around various types of rotating disk computer storage media. The discs may be permanently attached to, or removable from, the computer. For large computer systems such as mainframes and server farms , the discs may be connected to a network , and thus may be situated physically distant from the computers they serve.
The VRTX system is partially based on the Dell M1000e blade-enclosure and shares some technologies and components. There are also some differences with that system. The M1000e can support an EqualLogic storage area network that connects the servers to the storage via iSCSI, while the VRTX uses a shared PowerEdge RAID Controller (6Gbit PERC8).
Disk storage is now used in both computer storage and consumer electronic storage, e.g., audio CDs and video discs (VCD, DVD and Blu-ray). Data on modern disks is stored in fixed length blocks, usually called sectors and varying in length from a few hundred to many thousands of bytes. Gross disk drive capacity is simply the number of disk ...
The DVD specifications created and updated by the DVD Forum are published as so-called DVD Books (e.g. DVD-ROM Book, DVD-Audio Book, DVD-Video Book, DVD-R Book, DVD-RW Book, DVD-RAM Book, DVD-AR (Audio Recording) Book, DVD-VR (Video Recording) Book, etc.). [1] [2] [3] DVD discs are made up of two discs; normally one is blank, and the other ...
Rotary storage systems are filing cabinets; specialised office furniture units usually consisting of a double sided rotating unit, allowing the user to access two full sides of filing from one point. A foot pedal or lever is often used to operate the rotation mechanism, thus allowing user easy control.
Blu-ray Disc and HD DVD uses blue-violet lasers and focusing optics of greater aperture, for use with discs with smaller pits and lands, thereby greater data storage capacity per layer. [22] In practice, the effective multimedia presentation capacity is improved with enhanced video data compression codecs such as H.264/MPEG-4 AVC and VC-1.