| SCSI (Small Computer System Interface) is an | | | | speed environment, the major concern with such hard |
| intelligent interface.It hides the complexity of physical | | | | drives is heat. Although SCSI hard drive has a great |
| format. Every device attaches to the SCSI bus in a | | | | resistance to heat but at the time of power off and |
| similar manner. SCSI hard drives are faster than the | | | | condensation occurs, they are hard drive electronics |
| others. These hard drives are often used with servers | | | | that suffer the most. The electronic components may |
| that require high performance throughput. It can happen | | | | break down due to high stress conditions making a |
| with these hard drives that they may fail to perform | | | | hard drive worthless. |
| with required rate. | | | | In such cases, hard drive recovery is possible to the |
| Cause\ Explanation | | | | maximum extent as platters don’t suffer to the |
| The SCSI hard drives can’t start up when there is | | | | corresponding damage. |
| a physical failure. When the computer system is | | | | 2. Mechanical Failure: Hard drive can remain functional |
| powered on, SCSI BIOS gets the drive control from | | | | and tolerate vibrations until they strike read/write head. |
| system BIOS. This SCSI BIOS sends ‘Start Unit | | | | The head crash can be detected by strange noises. |
| Request’ to the SCSI devices including SCSI hard | | | | This problem can be resolved by hard drive |
| drive so that they may start and spin up. SCSI BIOS | | | | replacement after recovery service. At the same time |
| gets ‘Start Unit Request Completed’ along with | | | | there can be other, though minor, solutions too: |
| some additional information from drives in return. In | | | | 1 The user can disabl the Unit Request confirmation |
| case the task completion command is not received in | | | | from drive. |
| a specific interval of time by SCSI BIOS, it sends back | | | | 2 The user can make a jumper setting so as to ignore |
| an error message that might occur due to a hard drive | | | | SCSI BIOS process. The drive can be set to auto-start |
| failure: | | | | in which system starts as it gets power. |
| “Start Unit Request Faild” | | | | However if these solutions are not possible or fail, the |
| There could the following reasons for this error | | | | most appropriate solution is Hard Disk Recovery , using |
| message: | | | | Hard Drive Recovery Software which is meant to |
| 1. High Condensation and Electronic Failure: At high | | | | extract the lost data . |