4.0Performance characteristics
This section provides detailed information concerning
4.1Internal drive characteristics
| ST9600204SS | ST9450404SS |
|
| ST9600104SS | ST9450304SS |
|
Drive capacity | 600 | 450 | GB (formatted, rounded off value) |
Read/write data heads | 6 | 5 |
|
Bytes per track | 677,557 | 677,557 | Bytes (average, rounded off values) |
Bytes per surface | 100,021 | 75,016 | MB (unformatted, rounded off value) |
Tracks per surface (total) | 147,620 | 110,715 | Tracks (user accessible) |
Tracks per inch | 240,000 | 180,000 | TPI (average) |
Peak bits per inch | 1,430 | 1,430 | kBPI |
Areal density | 343 | 257.4 | Gb/in2 |
Internal data rate | 1.62 | 1.62 | Gb/s (variable with zone) |
Disc rotation speed | 10K | 10K | rpm |
Avg rotational latency | 3.0 | 3.0 | ms |
4.2Seek performance characteristics
See Section 10.4.1, "SAS physical interface" on page 59 and the SAS Interface Manual (part number 100293071) for additional timing details.
4.2.1Access time
|
| Including controller overhead1,2 (ms) | Not including controller overhead1,2 (ms) | |||
|
| Read | Write | Read | Write | |
|
|
|
|
|
| |
Average | 600GB | 4.0 | 4.6 | 3.8 | 4.4 | |
Single track | 0.50 | 0.76 | 0.30 | 0.56 | ||
Typical3,4 | ||||||
Full stroke |
| 8.01 | 8.38 | 7.81 | 8.18 | |
Average | 450GB | 4.0 | 4.6 | 3.8 | 4.4 | |
Single track | 0.50 | 0.76 | 0.30 | 0.56 | ||
Typical3,4 | ||||||
Full stroke |
| 7.96 | 8.51 | 7.76 | 8.31 | |
1.Execution time measured from receipt of the Command to the Response.
2.Assumes no errors and no sector has been relocated.
3.Typical access times are measured under nominal conditions of temperature, voltage, and horizontal orientation as measured on a representative sample of drives.
4.Access time = controller overhead + average seek time and applies to all data transfer commands. Access to data = access time + latency time.
Savvio 10K.4 SAS Product Manual, Rev. A | 9 |
