Pulsar XT.2 SAS Product Manual, Rev. B
11
5.0
Performance characteristics
This section provides detailed information concerning performance-related characteristics and features of Pul-
sar XT.2 drives.
Note.
Data provided is based on format at 512-bytes.
5.1
Internal drive characteristics
ST400FX0002
ST200FX0002
ST100FX0002
ST400FX0012
Drive capacity
400
200
100
GB
(formatted, rounded off value)
Flash Memory Type
NAND SLC
Emulated LBA Size
512, 520, 524, 528, 4096, 4160, 4192, or 4224
Native Programmable Page Size
4096 User Bytes
Default Transfer Alignment Offset
0
5.2
Performance characteristics
See Section 11.4.1, "SAS physical interface" and the
SAS Interface Manual
(part number 100293071) for addi-
tional timing details.
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)
400GB
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.
100/200 GB
1,2
Read
Write
Read
Write
Average
Typical
3
268
133
208
121
Page to Page
268
133
207
121
Average Latency
247
188
