ST340815AS Seagate 3.5″ hard drive with a storage capacity of 40GB and featuring a SATA interface.
All information about the Seagate ST340815AS hard disk drive: technical parameters, failure symptoms, HDD PCB repair and recommended retailers.

Seagate ST340815AS Technical Details:
- Disk Family: Barracuda 7200.10
- Type: HDD
- Purpose: desktop
- Form Factor: 3.5″
- Storage Capacity: 40 GB
- Buffer memory: 8 MB
- The number of heads: 1
- Number of plates: 1
- Speed of rotation: 7200 rpm
- Disk Interface: SATA 3Gb/s
- External data transfer rate: 300 MB/s
- Internal data transfer rate: 930 Mbps
- Support NCQ: yes
- Average access time, reading: 11 MS
- Average access time, record: 12 MS
- Access time track to track: 1 MS
- The average time delay (Latency): 4.16 msec
- Shock resistance at work: 63 G
- Shock resistance during storage: 350 G
- Noise idle: 28 dB
- Operating noise level: 32 dB
- Power consumption: 9 W
- Weight: 365 g
Seagate ST340815AS Hard Drives:
- ST340815AS Seagate BarraCuda 40GB 7200RPM SATA 3Gb/s 8MB Cache Hot Swappable 3.5-Inch Hard Drive
Seagate ST340815AS 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 ST340815AS HDD PCB Repair:
When it comes to data recovery one of the most common problems Seagate ST340815AS 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.