WD400JB Western Digital 3.5″ hard drive with a storage capacity of 40GB and featuring a IDE interface. WD400JB Western Digital Caviar 40GB 7200RPM EIDE 8MB Cache Dma/ata100 (ultra) 40-Pin 3.5-inch Low Profile (1.0 inch) Hard Drive.

All information about the Western Digital WD400JB hard disk drive: technical parameters, failure symptoms, free asked questions, reviews, HDD repair and data recovery.

Western Digital WD400JB Technical Details:

• Hard Disk Model: WDC WD400JB
• Disk Family: Caviar SE
• Form Factor: 3.5″
• Capacity: 40 GB (40 x 1 000 000 000 bytes)
• Number Of Disks: 1
• Number Of Heads: 1
• Rotational Speed: 7200 RPM
• Rotation Time: 8.33 ms
• Average Rotational Latency: 4.17 ms
• Disk Interface: Ultra-ATA/100
• Buffer-Host Max. Rate: 100 MB/seconds
• Buffer Size: 8192 KB
• Drive Ready Time (typical): 7 seconds
• Average Seek Time: 8.9 ms
• Track To Track Seek Time: 2.0 ms
• Full Stroke Seek Time: 21.0 ms
• Width: 101.6 mm (4.00 inch)
• Depth: 147 mm (5.79 inch)
• Height: 26.1 mm (1.03 inch)
• Weight: 600 grams (1.32 pounds)
• Acoustic (Idle): 3.5 Bel
• Acoustic (Min performance and volume): 3.7 Bel
• Acoustic (Max performance and volume): 3.9 Bel
• Required Power For Spinup: 1005 mA
• Power Required (Seek): 7.0 W
• Power Required (Idle): 7.0 W
• Power Required (Standby): 1.0 W
• Manufacturer: Western Digital Corporation

Western Digital WD400JB Hard Drives:

• Western Digital 40GB 7200RPM WD400JB 3.5" HDD
• WD400JB-00JJC0, DCM DSBANTJCA, Western Digital 40GB IDE 3.5″ Hard Drive
• WD400JB-00JJC0, DCM DSBHYTJCA, Western Digital 40GB IDE 3.5″ Hard Drive
• WD400JB-00JJC0, DCM DSBHYTJAA, Western Digital 40GB IDE 3.5″ Hard Drive
• WD400JB-00JJC0, DCM DBCHNTJEAN, Western Digital 40GB IDE 3.5″ Hard Drive
• WD400JB-00JJC0, DCM HSCHYTJEHN, Western Digital 40GB IDE 3.5″ Hard Drive
• WD400JB-00JJC0, DCM ESBAYTJAA, Western Digital 40GB IDE 3.5″ Hard Drive
• WD400JB-00JJC0, DCM DSCHYTJEAN, Western Digital 40GB IDE 3.5″ Hard Drive
• WD400JB-00JJC0, DCM HBBACTJEAN, Western Digital 40GB IDE 3.5″ Hard Drive
• WD400JB-00JJC0, DCM HBCHYTJEHN, Western Digital 40GB IDE 3.5″ Hard Drive
• WD400JB-00JJC0, DCM HSCACTJAA, Western Digital 40GB IDE 3.5″ Hard Drive
• WD400JB-00JJC0, DCM HSBHNTJAH, Western Digital 40GB IDE 3.5″ Hard Drive
• WD400JB-00JJC0, DCM DSCANTJAAN, Western Digital 40GB IDE 3.5″ Hard Drive
• WD400JB-00JJC0, DCM DSBAYTJEHN, Western Digital 40GB IDE 3.5″ Hard Drive
• WD400JB-00JJC0, DCM DSBANTJCH, Western Digital 40GB IDE 3.5″ Hard Drive
• WD400JB-00JJC0, DCM HSBHNTJAHN, Western Digital 40GB IDE 3.5″ Hard Drive
• WD400JB-00JJC0, DCM HSCAYTJEHN, Western Digital 40GB IDE 3.5″ Hard Drive
• WD400JB-00JJC0, DCM DSBAYTJCA, Western Digital 40GB IDE 3.5″ Hard Drive
• WD400JB-00ENA0, DCM DSBANV2AH, Western Digital 40GB IDE 3.5″ Hard Drive
• WD400JB-00JJC0, DCM HSCAYTJEAN, Western Digital 40GB IDE 3.5″ Hard Drive
• WD400JB-00JJC0, DCM HSBHNTJAA, Western Digital 40GB IDE 3.5″ Hard Drive
• WD400JB-00JJC0, DCM DSBANTJAH, Western Digital 40GB IDE 3.5″ Hard Drive
• WD400JB-00JJC0, DCM DSCHNTJAH, Western Digital 40GB IDE 3.5″ Hard Drive
• WD400JB-00JJC0, DCM ESBACTJAA, Western Digital 40GB IDE 3.5″ Hard Drive
• WD400JB-00JJC0, DCM HSBHYTJAA, Western Digital 40GB IDE 3.5″ Hard Drive

Western Digital WD400JB 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 WD400JB Data Recovery & HDD Repair:

When it comes to data recovery one of the most common problems Western Digital WD400JB Hard Disk Drive experience is burnt circuit board(PCB). So if you will need to match a replacement PCB, it is important that you note the “Board Number” of your current circuit board in addition to the hard drive’s “Model Number“.

Multiple PCB Number revisions:
2060-701292-002, 2060-70292-000, 2060-001209-004, 2060-701292-000, 2060-001189-003, 2060-001175-000, etc.

Multiple Model Number revisions:
WD400JB-00FMA0, WD400JB-00JJC0, WD400JB-00ETA0, WD400JB-00ENA0, etc.