Seagate Enterprise Capacity 3.5 HDD/Constellation ES Constellation ES (.1) SAS - Page 15

Performance Characteristics

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4.0 PERFORMANCE CHARACTERISTICS This section provides detailed information concerning performance-related characteristics and features of Constellation ES.1 drives. 4.1 INTERNAL DRIVE CHARACTERISTICS ST2000NM0001 ST1000NM0001 ST2000NM0021 ST1000NM0021 ST2000NM0041 ST1000NM0041 Drive capacity 2TB 1TB Read/write data heads 8 4 Bytes per track 1,012,608 1,012,608 Bytes per surface 250,000 250,000 Tracks per surface (total) 248,600 248,600 Tracks per inch 237,000 237,000 Peak bits per inch 1,523,000 1,523,000 Areal density 324 324 Internal data rate 95 - 212 95 - 212 Disk rotation speed 7200 7200 Avg rotational latency 4.16 4.16 ST500NM0001 ST500NM0021 ST500NM0041 500GB 2 1,012,608 250,000 248,600 237,000 1,523,000 324 95 - 212 7200 4.16 (formatted, rounded off value) Bytes (average, rounded off values) MB (unformatted, rounded off value) Tracks (user accessible) TPI (average) BPI Gb/in2 MB/s (variable with zone) rpm ms 4.2 SEEK PERFORMANCE CHARACTERISTICS See Section 11.4.1, "SAS physical interface" on page 53 and the SAS Interface Manual (part number 100293071) for additional timing details. 4.2.1 Access time Average Typical3,4 Single track Typical3,4 Full stroke Typical3,4 Not including controller overhead1, 2 (ms) Read Write 8.3 9.3 0.5 0.8 18 19 Including controller overhead1, 2 (ms) Read Write 8.5 9.5 0.7 1.0 18.2 19.2 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. 4.2.2 Format command execution time for 512-byte sectors (minutes) Maximum (with verify) Maximum (without verify) 2TB models 627 314 1TB models 345 173 500GB models 173 86 Execution time measured from receipt of the last byte of the Command Descriptor Block (CDB) to the request for a Status Byte Transfer to the Initiator (excluding connect/disconnect). When changing sector sizes, the format times shown above may need to be increased by 30 minutes. CONSTELLATION ES.1 SAS PRODUCT MANUAL, REV. G 9

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C
ONSTELLATION
ES.1 SAS P
RODUCT
M
ANUAL
, R
EV
. G
9
4.0
P
ERFORMANCE CHARACTERISTICS
This section provides detailed information concerning performance-related characteristics and features of Constellation ES.1 drives.
4.1
I
NTERNAL DRIVE CHARACTERISTICS
ST2000NM0001
ST1000NM0001
ST500NM0001
ST2000NM0021
ST1000NM0021
ST500NM0021
ST2000NM0041
ST1000NM0041
ST500NM0041
Drive capacity
2TB
1TB
500GB
(formatted, rounded off value)
Read/write data heads
8
4
2
Bytes per track
1,012,608
1,012,608
1,012,608
Bytes (average, rounded off values)
Bytes per surface
250,000
250,000
250,000
MB (unformatted, rounded off value)
Tracks per surface (total)
248,600
248,600
248,600
Tracks (user accessible)
Tracks per inch
237,000
237,000
237,000
TPI (average)
Peak bits per inch
1,523,000
1,523,000
1,523,000
BPI
Areal density
324
324
324
Gb/in
2
Internal data rate
95 - 212
95 - 212
95 - 212
MB/s (variable with zone)
Disk rotation speed
7200
7200
7200
rpm
Avg rotational latency
4.16
4.16
4.16
ms
4.2
S
EEK PERFORMANCE CHARACTERISTICS
See Section 11.4.1, "SAS physical interface" on page
53 and the
SAS Interface Manual
(part number 100293071) for additional timing
details.
4.2.1
Access time
Not including controller overhead
2
(ms)
1
1.
Execution time measured from receipt of the Command to the Response.
,
Average
Typical
4
3
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.
8.3
9.3
8.5
9.5
Single track
Typical
3,4
0.5
0.8
0.7
1.0
Full stroke
Typical
3,4
18
19
18.2
19.2
4.2.2
Format command execution time for 512-byte sectors (minutes)
2TB models
1TB models
500GB models
Maximum (with verify)
627
345
173
Maximum (without verify)
314
173
86
Execution time measured from receipt of the last byte of the Command Descriptor Block (CDB) to the request for a Status Byte Transfer to
the Initiator (excluding connect/disconnect).
When changing sector sizes, the format times shown above may need to be increased by 30 minutes.
2.
Assumes no errors and no sector has been relocated.
Including controller overhead
1, 2
(ms)
Read
Write
Read
Write