Seagate ST3000NM0023 Constellation ES.2 SAS Product Manual - Page 16
Standard features, Media description, Performance - seek time
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4.1 Standard features Constellation ES.2 drives have the following standard features: • Perpendicular recording technology • 1.5 / 3.0 / 6.0 Gb Serial Attached SCSI (SAS) interface • Integrated dual port SAS controller supporting the SCSI protocol • Support for SAS expanders and fanout adapters • Firmware downloadable using the SAS interface • 128 - deep task set (queue) • Supports up to 32 initiators • Jumperless configuration. • User-selectable logical block size (512, 520 or 528 bytes per logical block). • Industry standard 3.5-inch dimensions • Programmable logical block reallocation scheme • Flawed logical block reallocation at format time • Programmable auto write and read reallocation • Reallocation of defects on command (Post Format) • ECC maximum burst correction length of 400 bits • No preventive maintenance or adjustments required • Embedded servo design • Dedicated head load/unload zone • Self diagnostics performed when power is applied to the drive • Vertical, horizontal, or top down mounting • 64 MB data buffer (see Section 5.5). • Drive Self Test (DST) • Background Media Scan (BMS) • Idle Read After Write (IRAW) • Power Save Constellation® ES.2 SAS Self-Encrypting Drive models have the following additional features: • Automatic data encryption/decryption • Controlled access • Random number generator • Drive locking • 16 independent data bands • Cryptographic erase of user data for a drive that will be repurposed or scrapped • Authenticated firmware download 4.2 Media description The media used on the drive has a aluminum substrate coated with a thin film magnetic material, overcoated with a proprietary protective layer for improved durability and environmental protection. 4.3 Performance • Programmable multi-segmentable cache buffer • 600MB/s maximum instantaneous data transfers. • 7200 RPM spindle. Average latency = 4.16ms • Background processing of queue • Supports start and stop commands (spindle stops spinning) • Adaptive seek velocity; improved seek performance Note. There is no significant performance difference between Self-Encrypting Drive and standard (nonSelf-Encrypting Drive) models. 8 Constellation ES.2 SAS Product Manual, Rev. C