Fixing a chrashed hard disk


There is nothing as shocking as having all your important data disappear right in front of your eyes. All those music collections, the movies you had saved, the documents your whole life. As for now your computer is as good as dead with out the data you relied on a lot. your heart is pulsating fast, you know its all over and there is nothing you can do to bring it back. You take it to the computer fix shop and they to give you the sad news.
Actually there is something you can still do to get the stuff you value most. If you have tried using data recovery software's and you still don't get anything out of it try to place it in the freezer.
A hard disk contains platters inside it and heads that read and write information on them. They are very sensitive and the heads are so close to the platters surface even a small dust particle can make it crush. That's why hard disk drives are air proof. if the heads became lose and lost its position it is probably touching the surface of the platters making it impossible to read the information on the disk, but placing it in freezer will contract and regain its original shape allowing you to save as much information from it as possible. This method is not permanent, as soon as the hard disk becomes warm it will lose its position. but you will have collected some data from it. you can try it again until your feeling satisfied.
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Freeze It Heat It Hard Disk Recovery Myths

In old days, before IDE, the older drives from the mid-80s that used stepper motors, functioning of hard disks were sensitive to heat and cold. But over the period, hard disk manufactures developed materials that are less or marginally affected by heat and cold. Remember the Monday morning blues error that resulted bad sectors showing up on hard disks. This happened in cold weathers, especially after the computer being off overnight or over the weekend (thus the name). These stepper motor hard disks could not compensate for thermal expansion of the disk platters and might not be able to read the tracks on the drive until the disk has warmed up. Waiting a half-hour might see the problem go away, but in the long run the disk will need to be low-level formatted again. None of this applies to modern IDE or SCSI hard disks.
In view of the above, the freeze-it myth is exciting and makes some sense, but the consequences might be a disaster. The modern hard disks have read/write calibration mechanism so that the heads are properly positioned over the disk surface at a determined heat or cold tolerance. This enables the heads to read and write the correct tracks without any kind of error.
These parameters are recorded in ROM memory located on the logic board in some models and series AND/OR one part in ROM and the other in EPROM. In some models, the parameters are recorded in some types of flash memory located inside the drive. This is the reason why sometimes the replacement of a burned logic board does not recover hard drive even both drives are identical using same firmware version. This indicates that something is wrong on the inside.
In addition, there's also a type of surface recording called "servo", installed during the manufacturing process of the hard drive. The "servo" helps the heads to correctly positioned while running.
This resulted someone to put a hard drive in freezer and connect back it to PC. The system recognized the drive and worked again for several minutes. Then again freeze the hard drive it worked for a few minutes more, providing some more minutes to save some information from the hard disk.
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Critical steps in Data Recovery

Always use an uninterruptible power supply (UPS) to protect your hard disk against power surges. Electricity surges are the most dangerous thing among all that can cause damage to hard disk.
If you listen any sounds of clicking, grinding or whirring from your hard drive then shut down your computer immediately. Read/write heads make such sounds by hitting or scraping the platters and may cause severe or complete data loss. No data recovery software can repair a physically damaged hard disk.
Unplug the power to the computer before removing the hard drive and handle the drive carefully. Hard drives are extremely sensitive to static electricity and physical jarring or jolts.
If your data is critical, make sure you choose a reputable recovery firm that can properly recover data from physically damaged drives. Even the simplest recovery attempts on a physically damaged drive could render your data unrecoverable.
The first recovery attempt is always the best recovery attempt and must be handled by a some competent engineers. Data recovery professionals use the safest methods available to insure your data is not lost from repeated recovery attempts.
When disaster strikes:

  • If possible, back up the data immediately

  • In case your hard drive drive is making scraping, tapping, clicking or humming sounds, utility software for data recovery should not be used. The only best solution is to stop using the hard disk immediately.

  • Do not power up a device that has obvious physical damage or is making unusual sounds

  • Shut down the computer to avoid further damage to the drive and its data

  • Do not attempt recovery yourself on severely traumatized drives (i.e., turning the computer off and on, using over-the-counter diagnostic tools). This may cause further damage or permanent data loss

  • If you've lost critical data, DriveSavers recovery service is your best and safest option

  • Never assume data is unrecoverable

  • DriveSavers has successfully recovered data from hundreds of thousands of drives with extreme physical and logical damage
Best practices

  • Backup frequently and never upgrade any system without a verified backup

  • Use up-to-date hardware and software utilities for data security, such as firewalls and virus protection

  • Scan all data for viruses, including packaged software

  • Use air ventilation, fans and/or air conditioning to keep server conditions at the proper operating temperature

  • Power down and take extreme caution when moving computers

  • Avoid static discharge when touching or handling the media, especially in excessively dry environments
Backup strategies

  • Use extra backup systems

  • Adopt a structured backup procedure and always make copies of all critical data files, using software compatible with the operating system and applications

  • Periodically verify the data backups, especially databases and other critical files

  • Keep at least one verified copy of critical data offsite that is not connected to the running system

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by : BTF
 
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