HM640JJ Samsung 2.5″ hard drive with a storage capacity of 640GB and featuring a SATA interface. HM640JJ Samsung Spinpoint HM640JJ 640 GB 2.5 Plug-in Module Hard Drive SATA/300 7200 rpm 16 MB Buffer.

All information about the Samsung HM640JJ hard disk drive: technical parameters, failure symptoms, free asked questions, reviews, HDD repair and data recovery.

Samsung HM640JJ Technical Details:

  • Hard Disk Model: SAMSUNG HM640JJ
  • Disk Family: SpinPoint MP4
  • Form Factor: 2.5″
  • Capacity: 640 GB (640 x 1 000 000 000 bytes)
  • Number Of Disks: 2
  • Number Of Heads: 4
  • Rotational Speed: 7200 RPM
  • Rotation Time: 8.33 ms
  • Average Rotational Latency: 4.17 ms
  • Disk Interface: Serial-ATA/300
  • Buffer-Host Max. Rate: 300 MB/seconds
  • Buffer Size: 16384 KB
  • Drive Ready Time (typical): 4 seconds
  • Average Seek Time: 11 ms
  • Width: 69.85 mm (2.75 inch)
  • Depth: 100.3 mm (3.95 inch)
  • Height: 9.5 mm (0.37 inch)
  • Weight: 119 grams (0.26 pounds)
  • Acoustic (Idle): 2.4 Bel
  • Acoustic (Min performance and volume): 2.6 Bel
  • Acoustic (Max performance and volume): 2.6 Bel
  • Required Power For Spinup: 1000 mA
  • Power Required (Seek): 2.4 W
  • Power Required (Idle): 0.85 W
  • Power Required (Standby): 0.25 W
  • Manufacturer: Samsung

Samsung HM640JJ Hard Drives:

HM640JJ Samsung 640GB SATA 2.5 Inch Hard Drive

  • HM640JJ, HM640JJ/D, FW 2AK10001, Samsung 640GB SATA 2.5″ Hard Drive
  • HM640JJ, HM640JJ, FW 2AK10001, Samsung 640GB SATA 2.5″ Hard Drive
  • HM640JJ, HM640JJ/M, FW 2AK10001, SSNE, Samsung 640GB SATA 2.5″ Hard Drive
  • HM640JJ, HM640JJ/M, FW 2AK10001, SSNS, Samsung 640GB SATA 2.5″ Hard Drive
  • ST640LM016, HM640JJ, FW 2AK10001, Samsung 640GB SATA 2.5″ Hard Drive
  • HM640JJ, HM640JJ/M, FW 2AK10002, SSNS, Samsung 640GB SATA 2.5″ Hard Drive

Samsung HM640JJ 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

Samsung HM640JJ Data Recovery & HDD Repair:

When it comes to data recovery one of the most common problems Samsung HM640JJ 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:
BF41-00315A, BF41-00320A, etc.