Western Digital 400GB 7200rpm Serial ATA-II-300 HDD w. 8MB Cache (WD4000YS) RAID Edition

Because desktop drives offer high capacity at a lower-than-SCSI cost, an unprecedented number of RAID systems are being designed around desktop drives. But life in a desktop computer doesn’t compare to the extreme environment in an always-on, high duty cycle RAID system. What’s needed is a drive engineered to thrive in a high-intensity RAID system while still offering traditional desktop value. That drive is the WD Caviar RE. Designed and manufactured to enterprise-class standards, WD Caviar RE drives provide enhanced reliability in a 24x7, high duty cycle environment. In addition, they offer a RAID-specific time-limited error recovery feature that improves compatibility with RAID adapters. WD Caviar RE hard drives are ideal for RAID server applications such as video surveillance, enterprise backup, document management, scientific computing, and similar demanding storage environments.

 

Product Benefits:

 

Reliability in high duty cycle environments – utilizing enterprise-class manufacturing processes, these drives are designed with enhanced reliability in a 24x7, continuous duty environment

 

RAID-specific time limited error recovery – improves compatibility with RAID adapters and prevents drive fallout caused by extended drive error-recovery processes

 

8 MB (SD) and 16MB (YR and YS) cached buffer – provides a higher percentage of cache hits and significantly faster time to data than industry-standard 2 MB versions

 

Fluid Dynamic Bearing technology – improves hard drive reliability, reduces heat, vibration and noise

 

Improved power controller – consumes approximately 25 percent less power, generates lower heat, and produces low vibration levels comparable to SCSI drives

 

Data Lifeguard Tools™ – software utility that works in conjunction with the embedded Data Lifeguard™ features (including shock protection, an environmental protection system, and embedded error detection and repair features) to make hard drive installation, management, and diagnostics simple and worry-free

 

Native Command Queuing (NCQ) - (WD5000YS, WD4000YR, WD4000YS, WD3200YS, AND WD2500YS only) Performance of a random I/O workload can be improved through intelligent re-ordering of the I/O requests so they read/write to and from the nearest available sectors and minimize the need for additional disk revolutions or head actuator movement.

 

SATA-specific Features

 

FlexPower™– connector technology that accepts power from either industry-standard or new SATA power supplies.

 

Hot plug support – allows swapping of hard drives without having to power down the system or reboot; promotes system design flexibility, data availability, and serviceability.

 

Backplane compatibility – uses the SATA industry standard connector which includes alignment ears and 3-stage electrical mating sequence, designed specifically for backplanes and hot pluggability.

 

SATA latching connector – provides a secure connection between the hard drive and the cable connector via a locking latch mechanism.

 

Recommended: Western Digital's Serial ATA cable with SecureConnect™ provides a 500 percent stronger cable-to-drive connection than first-generation SATA hard drives and cables; for use with Western Digital SATA drives only.

 

Note: If Western Digital's SecureConnect™ serial ATA cable is used, you must use the Legacy (Molex) power connection. The Legacy (Molex) power connection does not support hot-plugging. For more information on hot-plugging, please see Answer ID 941.
IMPORTANT: Because of the time-limited error recovery feature, this product is intended for server applications and is not recommended for use in desktop systems.

 

Product Specification:

 

Data transfer rate - buffer to host (SD and YR)  1.5 Gb/s 
Data transfer rate - buffer to host (YS)  3.0 Gb/s 
Data transfer rate - buffer to disk (SD and YR) 61 MB/s sustained 
Data transfer rate - buffer to disk (YS) 70 MB/s sustained 
Average read seek (SD and YR) 8.9 ms (average)
Average read seek (YS) 8.7 ms (average)
Track-to-track seek 2.0 ms (average)
Full stroke read seek (on reads and writes) 21 ms (average)
Average latency 4.2 ms nominal
Rotational speed 7200 RPM
Read cache Adaptive
Write cache Yes
Buffer 8 MB (SD) and 16MB (YR and YS)
Drive ready time 7 sec. (average)
Master/slave support Yes
IORDY support Yes
LBA support Yes
Error rate (non-recoverable) <1 in 1014 bits read
Warranty 5-year