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DLT

Short for Digital Linear Tape, a type of magnetic tape storage device originally developed by DEC and now marketed by several companies. DLTs are ½-inch wide and the cartridges come in several sizes ranging from 20 to over 40 GB. DLT drives are faster than most other types of tape drives, achieving transfer rates of 2.5 MBps

DAT

Acronym for digital audio tape, a type of magnetic tape that uses a scheme called helical scan to record data. A DAT cartridge is slightly larger than a credit card in width and height and contains a magnetic tape that can hold from 2 to 24 gigabytes of data. It can support data transfer rates of about 2 MBps. Like other types of tapes, DATs are sequential-access media.

DDS

Abbreviation of Digital Data Storage, the industry standard for digital audio tape (DAT) formats.

There are currently four kinds of DDS tapes.

Type of DDS	Tape Length in Meters	Compression On	Compression Off
DDS-1	90	2 GB	4 GB
DDS-2	120	4 GB	8 GB
DDS-3	125	12 GB	24 GB
DDS-4	150	20 GB	40 GB

LTO

Short for Linear Tape Open, a technology that was developed jointly by HP, IBM and Certance (Seagate) to provide a clear and viable choice in an increasingly complex array of tape storage options. LTO technology is an "open format" technology, which means that users will have multiple sources of product and media and the open nature of LTO technology also provides a means of enabling compatibility between different vendors' offerings.

QIC

Abbreviation for quarter-inch cartridge, pronounced quick, a standard for magnetic tape drives. QIC tapes are among the most popular tapes used for backing up personal computers. QIC tapes are divided into two general classes: full-size (also called data-cartridge) and minicartridge.
The QIC-40 and QIC-80 standards are sometimes referred to as floppy tape standards because they are designed to use a personal computer's existing floppy disk drive controller instead of requiring a customized controller.
The newest set of QIC standards are based on the Travan technology developed by 3M.
The various QIC standards are controlled by a consortium of manufacturers called the Quarter-Inch Cartridge Drive Standards, Inc. The term QIC, therefore, is used to refer both to the type of tape and to the standards-producing organization.

AIT

Short for Advanced Intelligent Tape, a magnetic tape storage system developed by Sony. AIT uses 8mm cassette tapes that can hold up to 100GB of data. AITs use helical scan technology and typically are used in data backup and data storage.