Western Digital Corp. WD4000YR hard drive specifications

Western Digital Caviar RE2 400GB Hard Drive

With 1.2 million hours MTBF, server duty cycle, next-generation SATA technology and state-of-the-art vibration tolerance, WD RE2 7200 RPM drives offer the best combination of reliability, high capacity and performance for enterprise applications. RAID-specific time-limited error recovery (TLER) - this feature, unique to WD, prevents drive fallout caused by the extended hard drive error-recovery processes common to desktop drives. Rotary Acceleration Feed Forward (RAFF) - optimizes operation and performance when the drives are used in vibration-prone multi-drive systems such as rack-mounted servers and network storage. 1.2 million hours MTBF, 24x7 100% duty cycle - the highest available reliability rating on high capacity drives.

Recommended software for Western Digital Corp. WD4000YR status and S.M.A.R.T. monitoring is ActiveSMART www.ariolic.com

Western Digital Corp.

HDD Part Number

Hard drive health monitoring software
ActiveSMART by Ariolic Software. Click to download ActiveSMART


Device Type
Hard drive - Internal hard drive

4 in

5.8 in

1 in

1.3 lbs

Hard Drive

Form Factor

400 GB

Interface Type
Serial ATA-150

Buffer Size
16 MB

Native Command Queuing (NCQ), Time-Limited Error Recovery (TLER), SecureConnect, FlexPower, Rotary Acceleration Feed Forward (RAFF)


Drive Transfer Rate
150 MBps

Internal Data Rate
65 MBps

Seek Time
8.7 ms (average) / 21 ms (max)

Track-to-Track Seek Time
0.9 ms

Average Latency
4.2 ms

Spindle Speed
7200 rpm


Mean time before failure
1,200,000 hour(s)

Storage Hard Drive / Non-Recoverable Errors
1 per 10^15

Start / Stop Cycles

Expansion / Connectivity

1 x Serial ATA-150 - 7 pin Serial ATA

Compatible Bays
1 x Internal - 3.5" x 1/3H


Microsoft Certifications
Works with Windows Vista

Manufacturer Warranty

Service & Support
5 years warranty

Service & Support Details
Limited warranty - Parts and labor - 5 years - Bring-in

Environmental Parameters

Humidity Range Operating
5 - 95%

Vibration Tolerance
0.75 g @ 20-300 Hz (operating) / 4 g @ 20-500 Hz (non-operating)

Sound Emission
29 dBA