Hard drive data recovery is used today for personal and professional computer data storage. Except accidentally deleted or lost documents from external hard drive, most other reasons for data loss from external hard drive can be either physical failure or logical failure. The top most causes for data loss from external hard drive:
Physical failure: a physical failure of the drive is one of the worst situations that can happen to you and your important information. The most common reasons for physical data loss from external hard drives:


In case of physical failure, it may be impossible for you to retrieve data from an external hard drive. You need to check the status of your device and locate the drive in question. In such cases, if you are not able to locate the device, then you need to restart the device and try to recover data from the drive. You can follow 'volume integrity check' to recover data from an external hard disk. Software failure: This is the least likely reason for data loss, as there is rarely a software issue which can lead to data loss. If you cannot access your disk drive, you need to boot your computer from a different windows partition and use the 'cdimage' utility to create a mirror image of your hard drive. In most cases, this will boot your computer from the very same partition which you were booting from previously. If the partition does not boot, you need to boot your computer from the optical drive. Many software programs include a utility to boot your computer from different partitions, including CD/DVD drives. To do this, select the "parted" command from the menu and then point to where you want to create a new partition. View this post for more details about data recovery service.


Operating System failure: There are a few reasons why an external hard drive might stop operating. For one, if you accidentally shut down the device without switching to BIOS first, your operating system could be programmed to stop booting from this drive. If the device is plugged into an AC power supply but plugged into a battery first, the operating system could think that the device is already powered on. Secondly, if you attempt to connect the device to different ports on your computer without first making sure that the port on the device is functional, you might have inadvertently set your computer to boot using the incorrect port. In these cases, all you have to do is reinstall your operating system.


Skit: You may need to run a disk recovery scan with the "disk troubleshoot" tool if the device has crashed due to incorrect I/O settings. For this, you need to disconnect the device from the system and then click on "My Computer". You can then browse through the My Computer folder and locate for the device drivers. To determine which device drivers were damaged or corrupted, you can use the tool's disk repair wizard.


Here is a post with a general information about this topic,check it out: https://www.encyclopedia.com/computing/dictionaries-thesauruses-pictures-and-press-releases/recovery-data.

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