Interface Specification; Further Information - HP Ultrium Drive Technical Reference Manual

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:
• Writes:
•
32 byte read:

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.
22 Media
~20 Kb/s
2 byte: 32 byte:
~1.4 Kb/s
2 byte: 32 byte:
~ 5.8 ms
32 byte write:
~70 Kb/s ~0.5s
4 KB:
~18.5 Kb/s
4 KB:
~ 15.8 ms
~1.8s