Data
loss results from the fact that the directory entries and/or
the FAT are deleted or contain incorrect information.
The operating
system works at an access to files as follows:
Read data from directory entry -> Read data in the data
area-> Read information from the FAT
and repeat from next to last step until file is completely
read. If the directory entries and/or the FAT are incorrect
or deleted, the operating system can not read however any
longer, although this is still in the data area. This is
the reason why users think, their data is lost - in reality
it is still available for recovery. Finding this data can
be very complex however sometimes, since the entire drive
has to be examined.
Data loss of the content itself
Data is completely lost,
if the content is damaged or overwritten (the file was not
lost due to incorrect information in the FAT or the directory
entries).
This
could have the following causes:
The Hard disk/floppy disk is physically damaged.
Viruses or something else destroyed the data.
Writing other files to the disk has led to it, that some
or all clusters of a file were changed. In this case only
a part of the data recovery can be done.
|
