head crash

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Noun1.head crash - (computer science) a crash of a read/write head in a hard disk drive (usually caused by contact of the head with the surface of the magnetic disk)
computer science, computing - the branch of engineering science that studies (with the aid of computers) computable processes and structures
crash - (computer science) an event that causes a computer system to become inoperative; "the crash occurred during a thunderstorm and the system has been down ever since"
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Failover: RAID acts to protect data against disk failure, but a failure in a storage controller can prevent applications from accessing the protected data.
A disk failure is now an afterthought, with customer-serviceable hot-swap disk drives, global hot spares, and algorithms to predict when a disk is going to fail before it actually fails so that it can be replaced ahead of time.
Regardless of where the user is or the time of the disk failure, the notebook hard drive can be quickly and easily swapped with the backup solution's hard drive containing the user's backed up partitions, applications, and files.
Most vendors will provide you with an implementation of RAID where one extra disk is used for parity information to recreate lost data in the event of a single disk failure. You should avoid any vendor that does not meet even this minimum criterion.
The result: video streams and storage capacity are ideally balanced and arebacked-up in such a way that the processes continue to run even if there is a hard disk failure. Moreover, the system allows for highest scalability.
"The Environment Agency's investigation concluded that there had been no breach of their environmental permit because there was no breach in the permitted emission limits from the plant and the operator's investigation to find out the reason for the bursting disk failure was thorough.
Marussia's Max Chilton was down in 20th, and with his session ending 40 minutes early due to a left-front brake disk failure on his car which forced him into a 360 degree spin on the approach to the righthander turn four.
The storage solution should also offer redundancy in the form of Redundant Array of Independent Disks (RAID) technology, either set to run in mirrored (RAID 1) or protected by parity (RAID 5) to protect against disk failure. Recovery is the next critical consideration, since there is no point in creating redundant data if it cannot be recovered when needed.
Anyone who has felt those heart-wrenching pangs of fear caused by a hard disk failure understands the need for a robust backup.
However, neither tape-based backups nor standard HA solutions protect against one type of threat: If an human error, software bug, disk failure or virus attack deletes or corrupts data that was recently created or updated there may be no way to recover that data.
The new Jasper Forest processors are capable of configuring storage as a RAID 5 or 6, protecting against single or dual disk failure, respectively.