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3.2
Formatted capacity
Model
ST750LX003
ST500LX003
*One GB equals one billion bytes when referring to hard drive capacity. Accessible capacity may vary depending on operating environment
and formatting.
3.2.1
LBA mode
When addressing these drives in LBA mode, all blocks (sectors) are consecutively numbered from 0 to n–1,
where n is the number of guaranteed sectors as defined above.
See Section 5.3.1, "Identify Device command" (words 60-61 and 100-103) for additional information about 48-
bit addressing support of drives with capacities over 137GB.
3.2.2
Solid State Hybrid feature
The Solid State Hybrid feature utilizes the addition of NAND Flash memory to enhance the performance of the
drive. Short random accesses to the NAND Flash are faster than disc accesses due to the elimination of seek
and rotational latencies and therefore it is used to store more frequently accessed data. The Momentus XT
uses a proprietary algorithm which monitors drive activity and determines the optimum data to maintain in the
NAND Flash for peak responsiveness. The Solid State Hybrid feature is self contained in the drive firmware
and functions independent of the host hardware or operating system. There are no special host system
requirements. Momentus XT can be installed in any standard SATA environment and will automatically opti-
mize.
Specifics of the Solid State Hybrid Feature:
• Powerful ECC correction on data read from the NAND Flash.
• Maintains a list of defective NAND Flash blocks and maps them out of use.
• Additional bad blocks added during use will be added to the list of defective blocks and taken out of use.
• Storage functionality is preserved with no data loss with any wear out of the NAND Flash.
• No user intervention required.
6
Formatted capacity*
750GB
500GB
Guaranteed sectors
1,465,149,168
976,773,168
Momentus XT Product Manual, Rev. F
Bytes per sector
4K emulated @ 512
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