Question: What is the model name of the tape drive whose manufacturer had a long list of mergers that formed Unisys ?

text: Tape drive
History
See also : Magnetic tape data storage § Chronological list of tape formats
A tape drive is a data storage device that reads and writes data on a magnetic tape. Magnetic tape data storage is typically used for offline, archival data storage. Tape media generally has a favorable unit cost and a long archival stability. A tape drive provides sequential access storage, unlike a hard disk drive, which provides direct access storage. A disk drive can move to any position on the disk in a few milliseconds, but a tape drive must physically wind tape between reels to read any one particular piece of data. As a result, tape drives have very large average access times. However, tape drives can stream data very quickly off a tape when the required position has been reached. For example, as of 2010[update] Linear Tape-Open (LTO) supported continuous data transfer rates of up to 140 MB/s, a rate comparable to hard disk drives.
Year Manufacturer Model Capacity Advancements
1951 Remington Rand UNISERVO 224 KB First computer tape drive , used ​ ⁄ 2 nickel -plated phosphor bronze tape
1952 IBM 726  Use of plastic tape ( cellulose acetate ) ; 7-track tape that could store every 6-bit byte plus a parity bit
1958 IBM 729  Separate read/write heads providing transparent read-after-write verification . As of January 2009 , the Computer History Museum in Mountain View , California has working IBM 729 tape drives attached to its working IBM 1401 system
1964 IBM 2400  9-track tape that could store every 8-bit byte plus a parity bit
1970s IBM 3400  Auto-loading tape reels and drives , avoiding manual tape threading Group coded recording for error recovery
1972 3M Quarter Inch Cartridge ( QIC-11 ) 20 MB Tape cassette ( with two reels ) Linear serpentine recording
1974 IBM 3850  Tape cartridge ( with single reel ) First tape library with robotic access
1975 ( various ) Kansas City standard  Use of standard audio cassettes
1977 Commodore International Commodore Datasette 1978 KB Also used standard audio cassettes
1980 Cipher ( F880 ? )  RAM buffer to mask start-stop delays
1984 IBM 3480 200 MB Internal takeup reel with automatic tape takeup mechanism . Thin-film magnetoresistive ( MR ) head
1984 DEC TK50 94 MB Digital Linear Tape ( DLT ) line of products
1986 IBM 3480 400 MB Hardware data compression ( IDRC algorithm )
1987 Exabyte / Sony EXB-8200 2.4 GB First helical digital tape drive Elimination of the capstan and pinch-roller system
1993 DEC Tx87  Tape directory ( database with first tapemark nr on each serpentine pass )
1995 IBM 3570  Servo tracks - factory-recorded tracks for precise head positioning ( Time Based Servoing or TBS ) Tape on unload rewound to the midpoint - halving access time ( requires two-reel cassette )
1996 HP DDS3 12 GB Partial Response Maximum Likelihood ( PRML ) reading method - no fixed thresholds
1997 IBM VTS  Virtual tape - disk cache that emulates tape drive
1999 Exabyte Mammoth-2 60 GB The small cloth-covered wheel cleaning tape heads Inactive burnishing heads to prep the tape and deflect any debris or excess lubricant Section of cleaning material at the beginning of each data tape
2000 Quantum Super DLT 110 GB Optical servo precisely positioning the heads