HP Ultrium Drive - Manual (Page 22)

Media 22
Interface specification
• Contactless, passive RF interface using a proximity inductive coupling with a range in the
order of millimeters.
• Power to the transponder is coupled through the interface.
• The range depends on implementation (10 to 20 mm is the maximum). The best error rate
performance will occur at short distances.
• The memory can be read from below (by a drive) or from the front (in libraries).
• 32 kilobits (4 kilobytes)
• Organized as 128 x 32 byte blocks
• >500K write cycles, 20 year data retention life
• Write size is word wide (2 bytes) or block wide (32 bytes)
• The transfer-rate performance of the cartridge memory is as follows:
• Reads:
2 byte: ~20 Kb/s 32 byte: ~70 Kb/s 4 KB: ~0.5s
• Writes: 2 byte: ~1.4 Kb/s 32 byte: ~18.5 Kb/s 4 KB: ~1.8s
• 32 byte read: ~ 5.8 ms 32 byte write: ~ 15.8 ms
Further information
• For general information about LTO-CM, see “LTO Cartridge Memory” in Chapter 5,
“Cartridges” in Background to Ultrium Drives, Volume 6 of the Ultrium Technical Manual.
• For suggestions of how to make use of cartridge memory in libraries, see “LTO Cartridge
Memory (LTO-CM)” in Chapter 5, “Supporting Ultrium Features” in Software Integration,
Volume 2 of the Ultrium Technical Manual.