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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