Hitachi began shipping the H-6495, a magnetic tape unit using a new 128-track format, in June 1997. The 128-track format, along with three-times data compression, enabled high-density recordings — about 30 GB of data per tape cartridge (10 GB of uncompressed data). Data transfer speeds over ACONARC channel connections were raised from the previous 9 MB per second to 17 MB per second.
Hitachi provided two H-6495 magnetic tape units to connect to magnetic tape libraries: the H-6495-524L with four drives and the H-6495-522LB with two standalone drives. With the H-6495-524L, up to eight units (32 drives) could be connected to one library unit. It could be connected to the enhanced H-6952 libraries, the H-6952-5 and the H-6952-6. Depending on the configuration, the tape storage capacity per library ranged between 9.9 and 263 terabytes.
|Model name||H-6495-524L||H-6495-522LB||H-6488-1(for reference)|
|Magnetic tape specifications||width: 1/2 inch, length: 315 m||width: 1/2 inch, length: 315 m
width: 1/2 inch, length: 165 m
|Number of tracks||128||36|
|Recording density [bytes/inch]||864,000||76,000|
|Tape speed [m/s]||2||2|
|Tape speed [m/s]||9.0 /17.0 *1||3.0/6.0 /9.0|
|Number of drives||4||2||4|
*1. When connected to an ACONARC channel.