Why we still could restore or retrieve deleted file or data
in computer, including file and data you delete or format accidently or because
of system partition damage, cloning reduction system or disk data unable to
read and write? Please follow and read the principles of hard disk data and file storage, hard disk format to get answers.
1. How to read file in hard disk?
Windows operational system reads file information from
directory, including file name, file name extension, file size, modification
date and cluster number of first cluster of file in data zone. Now we suppose
the first cluster is 0023. Windows will read data from cluster 0023. And find 0023
unit in FAT. If it reads the ending mark, it means the file has been read
completely. If not, save the next cluster number of data until Windows finds
file ending mark.
2. How to write file in hard disk?
When we prepare to save files in computer, Windows
operational system will find an empty zone in DIR to write down file name, file
size and creation date etc information. And find empty zone to save file in
Data zone. At the same time, write the first cluster of Data zone into DIR
zone. Other operations are similar to the file read in hard disk.
3. How to delete file?
When we are going to delete file or data in computer, Win 9X
system just change the first character of file in directory and instead it of
E5, not delete it from computer completely.
4. How to format hard disk?
Hard disk only could be used after disk partition, disk
format and Windows operational system installation are finished. The complete
disk data includes five parts, MBR, DBR, FAT, DIR and DATA. There is only one
MBR, but other parts could increase following the increasing of partition.
Hard disk format program only rewrites FAT table and modify
MBR and OBR when we format disk. Many data on DATA zone have not been changed. This
is the reason why hard disk could be recovered.
From the principles of disk format and data deletion, we
know data could be recovered if we find the starting location of file. But
please pay attention to that you have not covered this file before data
recovery.
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