ST9640420AS Seagate 2.5″ hard drive with a storage capacity of 640 GB and featuring a SATA interface. ST9640420AS SEAGATE 2.5″ 640 GB Serial-ATA/300 Momentus 7200.5 640420 7200 RPM Hard Drive.
All information about the Seagate ST9640420AS hard disk drive: technical parameters, failure symptoms, free asked questions, reviews, HDD repair and data recovery.
Seagate ST9640420AS Technical Details:
- Hard Disk Model: SEAGATE ST9640420AS
- Disk Family: Momentus 7200.5 640420
- 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): 4.5 seconds
- Average Seek Time: 11 ms
- Track To Track Seek Time: 1.5 ms
- Full Stroke Seek Time: 22 ms
- Width: 69.85 mm (2.72 inch)
- Depth: 100.35 mm (3.94 inch)
- Height: 9.5 mm (0.35 inch)
- Weight: 115 grams (0.25 pounds)
- Acoustic (Idle): 2.3 Bel
- Acoustic (Min performance and volume): 2.5 Bel
- Acoustic (Max performance and volume): 3.0 Bel
- Required Power For Spinup: 1200 mA
- Power Required (Seek): 2.4 W
- Power Required (Idle): 1.2 W
- Power Required (Standby): 0.36 W
- Manufacturer: Seagate Technology
Seagate ST9640420AS Hard Drives:
- ST9640420AS SEAGATE 2.5″ 640 GB Serial-ATA/300 Momentus 7200.5 640420 7200 RPM Hard Drive.
Seagate ST9640420AS 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 ST9640420AS Data Recovery & HDD Repair:
When it comes to data recovery one of the most common problems Seagate ST9640420AS 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 100619769, etc.