Hard drive is one the most important part of a Mac or Windows PC. All important files including users data like photos, videos, documents, emails, programs data, etc are all stored on computer hard drive. So a hard drive data loss will be a big problem. In this article, Common causes that will delete files from computer hard drive will be talked, followed by things happen in the background when data are deleted, in the end, solutions to recover deleted files from computer hard drive will be given.
What may cause files been deleted from computer hard drive
Following are the common reasons which may cause files on computer hard drive been deleted:
1. computer blue screen or crashed and then can not boot up
2. Accidentally deleted important files from computer hard drive
3. Hard disk is corrupted
4. Accident format computer hard drive
5. Computer reset to factory settings which result in all personal data on computer hard drive been deleted
What happens when files are deleted or computer hard drive is formatted
Firstly a bit of background knowledge as how files are stored on computer hard drive and how those files are retrieved. The actual files data may store anywhere on computer hard drive, and there’s a file table which maintain the address of each file, so when user needs to read a file, the computer operation system first read the file table to get the address of file’s actual data. Then the actual data is read.
When files are deleted from computer hard drive, the computer operation system actually does not go to erase the actual data. Instead, it only go to file data and delete the file address entry. By doing this, the space occupied by file’s data is now free as no file in file table is pointing that address, so the address can be used for any new file. Moreover, the delete process will be fast as there’s no need to go to erase the actual data from computer hard disk.
Since the file’s actual data is not erased, there’s a chance to recover those data if we can read the hard disk bit and bit and then collect all pieces of data and form them into a file.
Hard drive crash or format will be similar to above, file table could be corrupted which may result in hard disk crash. When hard disk is formatted, all file’s data are still there, only all entries in file table is deleted.
Solution for hard disk data recovery
A hard drive data recovery software will scan the hard drive bit by bit, and then form the pieces of data into logical files. This is how hard disk file recovery tool works. So no matter hard disk is corrupted, or user format the hard disk, or files are deleted from hard drive, a good hard disk data recovery tool can help to restore lost files from Mac (or Windows PC).
(Tips: If the computer is dead and not bootable, you need to remove the hard disk and connect it to another computer as an external hard drive.)
Moreover, a good program which helps user to recover lost files should only do the read process but not the write operation on your computer, this can make sure your files’ safety will not be harmed by the data overwritten situation.
Find a good data recovery program is a little bit difficult ’cause you need to try and then judge if the software you choose is good or not. So, build a backup for your file is a good habit to protect your important file away from data loss problem. For more details about file rescue you can visit this post to get things you need.