Seagate ST400FX0002 Pulsar XT.2 SAS Product Manual - Page 19
Performance characteristics
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5.0 Performance characteristics This section provides detailed information concerning performance-related characteristics and features of Pulsar XT.2 drives. Note. Data provided is based on format at 512-bytes. 5.1 Internal drive characteristics Drive capacity Flash Memory Type Emulated LBA Size Native Programmable Page Size Default Transfer Alignment Offset ST400FX0002 ST200FX0002 ST100FX0002 ST400FX0012 400 200 100 GB (formatted, rounded off value) NAND SLC 512, 520, 524, 528, 4096, 4160, 4192, or 4224 4096 User Bytes 0 5.2 Performance characteristics See Section 11.4.1, "SAS physical interface" and the SAS Interface Manual (part number 100293071) for additional 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 1,2 100/200 GB1,2 Read Write Read Write Average Page to Page Average Latency 268 133 208 121 Typical 3 268 133 207 121 247 188 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. 2. 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 Pulsar XT.2 SAS Product Manual, Rev. B 11