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OEM FUNCTIONAL SPECIFICATION ULTRASTAR XP (DFHC) SSA MODELS 1.12/2.25 GB - 1.0" HIGH
1.0 Description
1.1 Features
1.1.1 General Features
1.12/2.25/4.51 gigabytes formatted capacity (512 bytes/sector)
Serial Storage Architecture (SSA) attachment (dual port)
Brick On Sled carrier and 3.5" small form factor models
Rotary voice coil motor actuator
Closed-loop digital actuator servo (embedded sector servo)
Magnetoresistive (MR) heads
(0,8,6,infinity) 8/9 rate encoding
Partial Response Maximum Likelihood (PRML) data channel with digital filter
All mounting orientations supported
Jumperable auto spindle motor start
Jumperable write protection
Spindle synchronization
Two LED drivers
Bezel (optional)
1.1.2 Performance Summary
Average read seek time (1.12 GB): 6.9 milliseconds
Average read seek time (2.25 GB): 7.5 milliseconds
Average read seek time (4.51GB): 8.0 milliseconds
Average Latency: 4.17 milliseconds
Split read/write control
Media data transfer rate: 9.59 to 12.58 MegaBytes/second (10 bands)
SSA data transfer rate: 20 Megabytes/second
1.1.3 Interface Controller Features
Multiple initiator support
Supports blocksizes from 256 to 5952 bytes
512K byte, multi-segmented, dual port data buffer
Read-ahead caching
Adaptive caching algorithms
Write Cache supported (write back & write thru)
Tagged command queuing
Command reordering
Back-to-back writes (merged writes)
Split reads and writes
Nearly contiguous read/write
Link error recovery procedure exit
Disable registration
Duplicate tags
Two byte ULP message codes
SCSI response
Move data transfer messages
Multiple ULP's
Automatic retry and data correction on read errors
Source filename=DESCRIP IBM Corporation Page 9 of 87