Seagate ST200FM0002 Pulsar.2 SAS Product Manual - Page 20

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5.2.1 Access time Access measurements are taken with nominal power at 25°C ambient temperature. All times are measured using drive diagnostics. The specifications in the table below are defined as follows: • Page-to-page access time is an average of all possible page-to-page accesses in both directions for a sequentially preconditioned drive. • Average access time is a true statistical random average of at least 5000 measurements of accesses between programmable pages on a randomly preconditioned drive. Table 4: Typical Access Time (μsec) 800GB 1,2 Read Average Page to Page Average Latency 1. 2. 3. Typical 3 293 62 273 Write 137 136 400, 200, 100 GB 1,2 Read 227 60 206 Write 120 120 Execution time measured from receipt of the Command to the Response. Assumes no errors. Typical access times are measured under nominal conditions of temperature, voltage, and horizontal orientation as measured on a representative sample of drives. Note. These drives are designed to provide the highest possible performance under typical conditions. However, due to the nature of Flash memory technologies there are many factors that can result in values different than those stated in this specification FORMAT UNIT command execution time for 512-byte LBA's (minutes) 2. 5.2.2 The device may be formatted as either a Thin Provisioned device or a Fully Provisioned device. The default format is Thin Provisioned and is recommended for most applications. Thin Provisioning provides the most flexibility for the device to manage the flash medium to maximize endurance. Table 5: Non-SED Non-SED Non-SED Non-SED SED SED SED SED Maximum FORMAT UNIT Times (minutes) Configuration Format Mode (Default) Thin Provisioned (Default) Thin Provisioned Fully Provisioned Fully Provisioned (Default) Thin Provisioned (Default) Thin Provisioned Fully Provisioned Fully Provisioned DCRT Bit DCRT = 0 DCRT = 1 DCRT = 0 DCRT = 1 DCRT = 0 DCRT = 1 DCRT = 0 DCRT = 1 IP Bit IP = 0 IP = 0 IP = 1 IP = 1 IP = 0 IP = 0 IP = 1 IP = 1 800GB 5 5 430 280 5 5 430 280 400GB 5 5 130 100 N/A N/A N/A N/A 200GB 5 5 70 50 N/A N/A N/A N/A 100GB 5 5 60 30 N/A N/A N/A N/A 12 Pulsar.2 SAS Product Manual, Rev. B

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12
Pulsar.2 SAS Product Manual, Rev. B
5.2.1
Access time
Access measurements are taken with nominal power at 25°C ambient temperature. All times are measured
using drive diagnostics. The specifications in the table below are defined as follows:
•
Page-to-page access time is an average of all possible page-to-page accesses in both directions for a
sequentially preconditioned drive.
•
Average access time is a true statistical random average of at least 5000 measurements of accesses
between programmable pages on a randomly preconditioned drive.
5.2.2
FORMAT UNIT command execution time for 512-byte LBA’s (minutes)
The device may be formatted as either a Thin Provisioned device or a Fully Provisioned device. The default
format is Thin Provisioned and is recommended for most applications. Thin Provisioning provides the most
flexibility for the device to manage the flash medium to maximize endurance.
Table 5:
Maximum FORMAT UNIT Times
(minutes)
Configuration
Format Mode
DCRT Bit
IP Bit
800GB
400GB
200GB
100GB
Non-SED
(Default) Thin Provisioned
DCRT = 0
IP = 0
5
5
5
5
Non-SED
(Default) Thin Provisioned
DCRT = 1
IP = 0
5
5
5
5
Non-SED
Fully Provisioned
DCRT = 0
IP = 1
430
130
70
60
Non-SED
Fully Provisioned
DCRT = 1
IP = 1
280
100
50
30
SED
(Default) Thin Provisioned
DCRT = 0
IP = 0
5
N/A
N/A
N/A
SED
(Default) Thin Provisioned
DCRT = 1
IP = 0
5
N/A
N/A
N/A
SED
Fully Provisioned
DCRT = 0
IP = 1
430
N/A
N/A
N/A
SED
Fully Provisioned
DCRT = 1
IP = 1
280
N/A
N/A
N/A
Table 4:
Typical Access Time (
μ
sec)
800GB
1
,
2
1.
Execution time measured from receipt of the Command to the Response.
2.
Assumes no errors.
3.
Typical access times are measured under nominal conditions of temperature, voltage, and horizontal orientation as
measured on a representative sample of drives.
Note.
These drives are designed to provide the highest possible performance under typical conditions.
However, due to the nature of Flash memory technologies there are many factors that can result in
values different than those stated in this specification
2.
400, 200, 100 GB
1,2
Read
Write
Read
Write
Average
Typical
3
293
137
227
120
Page to Page
62
136
60
120
Average Latency
273
206