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Momentus XT Specifications
| Specifications |
500GB |
320GB |
250GB |
| Model Number |
ST95005620AS |
ST93205620AS |
ST92505620AS |
| Solid State Memory, SLC NAND (GB) |
4 |
4 |
4 |
| Interface |
SATA 3.0Gb/s NCQ |
SATA 3.0Gb/s NCQ |
SATA 3.0Gb/s NCQ |
| Cache |
32 MBytes |
32 MBytes |
32 MBytes |
| Spindle Speed (RPM) |
7200 |
7200 |
7200 |
| Configuration |
| Bytes per Sector |
512 |
512 |
512 |
| Reliability/Data
Integrity |
| Head-Rest Method |
QuietStep™
Ramp Load |
QuietStep™
Ramp Load |
QuietStep™
Ramp Load |
| Load/Unload Cycles |
>600,000 |
>600,000 |
>600,000 |
| Nonrecoverable Read errors per Bits Read |
1 per 10E14 |
1 per 10E14 |
1 per 10E14 |
| Power Management |
Power (W)
Seek,
Typical
Idle, Typical |
1.554
0.8 |
1.554
0.8 |
1.554
0.8 |
| Environmental |
Temperature (ºC)
Operating
Nonoperating |
0 to 60
-40 to 70 |
0 to 60
-40 to 70 |
0 to 60
-40 to 70 |
Shock (Gs)
Operating: 2ms
Nonoperating: 1ms |
350
1000 |
350
1000 |
350
1000 |
Acoustic (bels-sound power)
Idle, Typical
Seek, Typical |
2.3
2.5 |
2.3
2.5 |
2.3
2.5 |
| Physical |
| Height (in/mm) |
0.370/9.5 |
0.370/9.5 |
0.370/9.5 |
| Width (in/mm) |
2.75/69.85 |
2.75/69.85 |
2.75/69.85 |
| Depth (in/mm) |
3.951/100.35 |
3.951/100.35 |
3.951/100.35 |
| Weight (lb/g) |
0.238/110 |
0.238/110 |
0.238/110 |
Adaptive Memory
The Seagate Momentus XT drive
offers hybrid storage with Adaptive Memory technology, enabling the
drive to deliver higher capacities up to 500GB and SSD-like
performance. The Adaptive memory learns as you use the drive.
The first time you use the drive, it will perform like a 7200RPM
drive. The second time you use the drive it has learned about
80% of how you use your computer. The third time you use the
drive, it knows you. This is where the drive performs at its
best. Even though the drive knows you now, it will continue to
learn. Intelligent algorithms designed to learn and anticipate
your most demanding needs will continue to run. These
algorrithms are built into the drive and does not require any
software to use. Adaptive Memory technology is a Seagate
data management technique that constantly monitors and quickly
recalls data usage and preferences. It places files and data that
the user will likely access again and again into the solid state
portion of the drive. When the user requires the data or application
file, it already sits in an instantly accessible location, thereby
customizing system performance for the user. Constant monitoring
dynamically improves overall response time based on personal usage.
The SSD portion of the drive is made up of 4GB of SLC NAND flash
memory. Seagate chose 4GB due to a price vs. performance
analysis which determined that 4GB was the sweet spot.
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