3.1Standard features
Cheetah 15K.6 drives have the following standard features:
•1.5 / 3 Gbit 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.
•
•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 320 bits
•No preventive maintenance or adjustments required
•Dedicated head landing zone
•Embedded servo design
•Automatic shipping lock
•Self diagnostics performed when power is applied to the drive
•Zone bit recording
•Vertical, horizontal, or top down mounting
•Dynamic spindle brake
•16 Mbyte data buffer
•Drive Self Test
•Background Media Scan
•Power Save
Cheetah 15K.6 SAS FDE models have the following additional features:
•Automatic data encryption/decryption on all writes and reads to and from the media
•Cryptographic erase of user data for a drive that will be repurposed or scrapped
•Two independent data bands which each have it’s own ownership credential and encryption key
•Authenticated firmware download
3.2Media description
The media used on the drive has an aluminum substrate coated with a thin film magnetic material, overcoated with a proprietary protective layer for improved durability and environmental protection.
3.3Performance
•
•300 Mbytes/sec maximum instantaneous data transfers.
•15k RPM spindle. Average latency = 2.0 msec
•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 FDE and
8 | Cheetah 15K.6 SAS Product Manual, Rev. B |
