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Chapter 5 Specifications

Drive Performance Specifications

LTO-4 (Model B) Half-Height Tape Drive User’s Guide 47

Drive Performance Specifications

Tab l e 6 lists the performance specifications of the LTO-4 (Model B) Half-

Height Tape Drive.

Table 6 Drive Performance

Specifications

Specification Value

Average data access time

(820-m tape) from BOW

(beginning of wrap)

85 seconds

Average rewind time

(820-m tape)

88 seconds

Maximum rewind time

(820-m tape)

171 seconds

Capacity

LTO Ultrium 4 (820 m)

800 Gbytes (native)

Cartridge unload time <22 seconds (Half-Height drive)

Error recovery Read-after-write Reed Solomon ECC

(2 levels)

Flux density 13250 cells per mm

Head configuration 2 bumps

16 thin-film write heads per bump

16 MR read heads per bump

2 MR servo heads per bump

Maximum data access time

(650-m tape) from BOW

100 seconds (Half-Height drive)

Recording density 6,760 RLL-encoded ONEs per mm

Recording format Ultrium 16-channel (U-416)

Recording method 0, 13/11 RLL

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Quantum LTO 4 Guia do Utilizador Página 63