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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 10
15
bits read
1.2 Models
The Ultrastar XP SSA disk drive is available in various models as shown below.
The Ultrastar XP SSA data storage capacities vary as a function of model and user block size. The
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 the 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 13 for exact capacities based on user block size.
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