Glossary of PC terms: U

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Ultra-SCSI	Ultra SCSI doubles the external data transfer rate of fast SCSI. For details go here.
Ultra DMA	An advanced capability provided by ATA-4 interface. See also ATA, DMA.
Unloading the slider	See Load/Unload. See also Head Parking, CSS.
Universal Serial Bus (USB)	A serial bus designed for easy, hassle-free, and relatively inexpensive low and medium-speed applications.  At the low end, USB can sustain a transfer rate of less then 0.2 MB/s; in its fastest mode USB is capable of about 1.5 MB/s.  Allows connecting of up to 127 USB devices.  For details go here.

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