Performance Characteristics; Internal Drive Characteristics; Seek Performance Characteristics; Access Time - Seagate Constellation ES Product Manual

5.0

Performance characteristics

This section provides detailed information concerning performance-related characteristics and features of Con-
stellation ES.1 drives.
5.1

Internal drive characteristics

Drive capacity
Read/write data heads
Bytes per track
Bytes per surface
Tracks per surface (total)
Tracks per inch
Peak bits per inch
Areal density
Internal data rate
Disk rotation speed
Avg rotational latency
5.2

Seek performance characteristics

See Section 12.4.1, "SAS physical interface" on page 66 and the SAS Interface Manual (part number
100293071) for additional timing details.
5.2.1

Access time

3 4
Average Typical
,
Single track Typical 3,4
Full stroke Typical
3,4
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.
10
ST2000NM0001 ST1000NM0001 ST500NM0001
ST2000NM0021 ST1000NM0021 ST500NM0021
ST2000NM0041 ST1000NM0041 ST500NM0041
2TB 1TB
8 4
1,012,608 1,012,608
250,000 250,000
248,600 248,600
237,000 237,000
1,523,000 1,523,000
324 324
95 - 212 95 - 212
7200 7200
4.16 4.16
Not including controller overhead
Read Write
8.3 9.3
0.5 0.8
18 19
500GB (formatted, rounded off value)
2
1,012,608 Bytes (average, rounded off values)
250,000 MB (unformatted, rounded off value)
248,600 Tracks (user accessible)
237,000 TPI (average)
1,523,000 BPI
2
324 Gb/in
95 - 212 MB/s (variable with zone)
7200 rpm
4.16 ms
1 2
,
(ms) Including controller overhead
Read
8.5
0.7
18.2
Constellation ES.1 SAS Product Manual, Rev. E
1, 2
(ms)
Write
9.5
1.0
19.2