ST4000NM0255 Seagate 3.5″ hard drive with a storage capacity of 4TB and featuring a SAS interface.
All information about the Seagate ST4000NM0255 hard disk drive: technical parameters, failure symptoms, HDD PCB repair and recommended retailers.

Seagate ST4000NM0255 Technical Details:
- Storage Capacity: 4 TB
- Spindle Speed (rpm): 7200
- Buffer: 128 MB
- Disk Interface: SAS
- Drive Interface Standard: 12Gb/s SAS
- Drive Type: Internal
- Form Factor: 3.5″
- Height: 1.03″ (26.10 mm)
- Width: 4.01″ (101.85 mm)
- Depth: 5.79″ (147 mm)
- Weight (Approximate): 680 g
Seagate ST4000NM0255 Hard Drives:
- Seagate 4TB SAS Server Exos 7EB 12gbps 12G Hard Drive 3.5” ST4000NM0255
Seagate ST4000NM0255 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
Seagate ST4000NM0255 HDD PCB Repair:
When it comes to data recovery one of the most common problems Seagate ST4000NM0255 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 “PCB Number” of your current circuit board in addition to the hard drive’s “Model Number”.
Multiple PCB Number revisions:
, etc.