Western Digital WD40EDAZ

Aug 10, 2026

Western Digital WD40EDAZ 3.5″ hard drive with a storage capacity of 4 TB and featuring a SATA interface. Western Digital WD40EDAZ Blue 4 TB 3.5″ Internal Hard Drive Serial ATA-600 5400 RPM 256 MB Buffer.

All information about the Western Digital WD40EDAZ hard disk drive: technical parameters, failure symptoms, frequently asked questions, reviews, HDD repair and data recovery.

Western Digital WD40EDAZ Technical Details:

Manufacturer:

Western Digital

Hard Disk Model:

WD40EDAZ

Disk Family:

Blue

Form Factor:

3.5″

Capacity:

4 TB (4,000,000,000,000 bytes)

Formatted Capacity:

Approximately 3.63 TB

Rotational Speed:

5400 RPM

Average Seek Time:

12.0 ms (read) / 13.0 ms (write)

Disk Interface:

Serial ATA-600 (SATA 6 Gb/s)

Buffer Size:

262144 KB (256 MB)

External Transfer Rate:

600 MB/s

Mean Time Between Failures (MTBF):

500,000 hours

Note: The Western Digital WD40EDAZ is part of the Blue series, WD’s mainstream desktop hard drive line offering 4 TB capacity with 5400 RPM and large 256 MB cache.

Western Digital WD40EDAZ Hard Drives:

WD40EDAZ-11SLVB0, DCM , Western Digital 4TB SATA 3.5 Hard Drive
WD40EDAZ-11U78B0, DCM , Western Digital 4TB SATA 3.5 Hard Drive

Western Digital WD40EDAZ Failure Symptoms:

Electrical Failure Symptoms:
Drive is powered, but shows no sign of function;
Disk knocking as the motor fails to spin;
Clicking sound as the heads search or initialize;
Mechanical Failure Symptoms:
Clicking, grinding sounds;
Completely quiet due to ” motor freeze”;
“music” tone as the disk is powered up;
Logical Failure Examples:
Accidental deletion, accidental format, file corruption, software bugs, file system corruption, viruses and malware, and many, many more.
Firmware Failure Symptoms:
drive powers up, but is not recognised by the computer;
Drive powers up, but is recognised wrongly, sometimes with nonsensical characters;
Drive freezes during booting up;
Bad Platter Area Symptoms:
Hard disk still accessible but appear to “hang” or “sluggish”;
Constant Cyclic Redundancy (CRC) errors;
Unable to access folders or files which could be seen;
Complex Failure Model

Western Digital WD40EDAZ Data Recovery & HDD Repair:

When it comes to data recovery one of the most common problems Western Digital WD40EDAZ hard drive experience is a burned circuit board (PCB). Therefore, if you need to replace the PCB, be sure to match the “PCB Number” of the current board, such as 2060-810011-001 REV P1, etc.

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