Western Digital Re EX800M, Technical Reference Manual, Page: 12 / 60

Specifications EX800M
4 RELEASED 8/13/13 2679-771339-A05
2.0 S
PECIFICATIONS
Table 2-1. Physical Specifications
2.1 Performance Specifications
Table 2-2. Performance Specifications
Physical Specifications 1
WD4000FYYZ
WD4000FDYZ
2
WD3000FYYZ
WD3000FDYZ
2
WD2000FYYZ
WD2000FDYZ
2
Capacity 4 TB 3 TB 2 TB
Interface SATA 6 Gb/s SATA 6 Gb/s SATA 6 Gb/s
Disk count platform 5-disk 5-disk 3-disk
Number of Heads 10 8 6
Bytes per sector 512 512 512
User Sectors per Drive 7,814,037,168 5,860,533,168 3,907,029,168
Servo Type Embedded Embedded Embedded
Channel Recording Method LDPC–Low Density Parity Code
1
As used for storage capacity, one megabyte (MB) = one million bytes, one gigabyte (GB) = one billion bytes, and
one terabyte (TB) = one trillion bytes. Total accessible capacity varies depending on operating environment. As
used for buffer or cache, one megabyte (MB) = 1,048,576 bytes. As used for transfer rate or interface, megabyte
per second (MB/s) = one million bytes per second, and gigabit per second (Gb/s) = one billion bits per second.
Effective maximum SATA 6 Gb/s transfer rate calculated according to the Serial ATA specification published by the
SATA-IO organization as of the date of this document. Visit www.sata-io.org for details.
2
Optional SED model.
Average Seek (without overhead)
- Read
- Write
7.7 ms average
8.3 ms average
Average Latency 4.2 ms (nominal)
Rotational Speed 7200 RPM (nominal)
Data Transfer Rate (maximum at OD)
1
- Maximum burst interface transfer rate
- Maximum sustained interface transfer rate
6 Gb/s
WD4000FxYZ: 171 MB/s
WD3000FxYZ: 168 MB/s
WD2000FxYZ: 164 MB/s
Buffer Size 64 MB
Error Rate - Unrecoverable <10 in 10
16
bits read
Spindle Start Time
- From Power-on to Drive Ready
2 15s average (FAST spinup mode)
20s average (STANDARD spinup mode)
Spindle Stop Time <15s average
Load/Unload Cycles
3
600,000 minimum
1
As used for transfer rate or interface, megabyte per second (MB/s) = one million bytes per second, and gigabit
per second (Gb/s) = one billion bits per second. Effective maximum SATA 6 Gb/s transfer rate calculated
according to the Serial ATA specification published by the SATA-IO organization as of the date of this document.
Visit www.sata-io.org for details.
2
Defined as the time from power-on to the setting of Drive Ready and Seek Complete including calibration.
3
Controlled unload at ambient condition.