USER RESPONSIBLE FOR VERIFYING VERSION AND COMPLETENESS
OEM FUNCTIONAL SPECIFICATION ULTRASTAR XP (DFHC) SSA MODELS 1.12/2.25 GB -1.0" HIGH
Automatic sector reallocation
In-line alternate sector assignment for high-performance
Improved technique for down-loadable SSA firmware

1.1.4 Reliability Features

Self-diagnostics on power up
Dedicated head landing zone
Automatic actuator latch
Embedded Sector Servo for improving on-track positioning capability
Buffer memory parity
Longitudinal Redundancy Check (LRC) on Customer Data
ECC on the fly
Error logging and analysis
Data Recovery Procedures (DRP)
Predictive Failure Analysis (PFA &tm)
No preventative maintenance required
Two Field Replaceable Units (FRU's): Electronics Card and Head Disk Assembly (HDA)
Probability of not recovering data: 10 in 1015 bits read
1.2 Models
The Ultrastar XP SS A disk drive is available in various models as shown below.
The Ultrastar XP SS A data storage capacities vary as a function of model and user block size. Th e
emerging industry trend is capacity points in multiples of 1.08GB (i.e. 1.08/2.16/4.32) at a block size of 512
bytes. Future IBM products will plan to provide capacities that are consistent with this trend. Users that
choose to make full use of th e Ultrastar XP SSA drive capacity above the standard capacity points may not
find equivalent capacity breakpoints in future products.
Model # Capacity GB (@512 Byte) Form Factor Connector Type
C1B 1.12 Brick On Sled Carrier 128-pin HPC
C1C 1.12 3.5-inch Small FF 38-pin Unitized
C2B 2.25 Brick On Sled carrier 128-pin HPC
C2C 2.25 3.5-inch Small FF 38-pin Unitized
C4B 4.51 Brick On Sled carrier 128-pin HPC
C4C 4.51 3.5-inch Small FF 38-pin Unitized
Note: CxB models (C1B, C2B, and C4B) include a DC/DC converter, activity and check indicators.
Note: Please refer to section 2.1.1, “Capacity Equations” on page 13for exact capacities based onuser blocksize.
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