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Effective precaution-measures
The following information does not help
you, if you must now recover data. However it is helpful for a future data
recovery. You can increase the chances to recover data, if you consider some
points.
- Do not store important files in the root
directory.
Files, which are stored in the root directory, are sensitive to a
loss by quick formatting, because file entries are set-aside in the
root.
Avoid to store files directly in the root since the file disappears, if
the directory entry is damaged. In an emergency, one can recover data
very quickly if it is in a sub-directory.
- Defragment the hard drive regularly (using a
defragmentation program)
 Data is stored
in successive clusters, if sufficient connected free storage location is
available. Repeated deletion and write operations fragment the drive.
An example:
(1) (2) (3) (4) (5) (6) (7) (8) - should represent 8 small files
(1) (2) (3) (4)
(5) (6) (7) (8) - now files (2), (4), (7)
and (8) were deleted
(1) (9) (3)
(9) (5) (6)
(9) (9)
- disk is fragmented if a larger file is stored
If data is deleted from the disk, new data can take the free place. If
the new data is larger than the old one however, the data is not set
aside in coherent range, but in fragments.
When reading fragmented data the head of the hard disk has to 'jump'
(i.e. the head moves to the looked track). Thus the read and write speed
is reduced.
In order to make the read and write procedure again more efficient, it
is necesscary to reorganize the fragmented disk. After defragmentation,
the data is in sequential order and then look in such a way:
(1) (9) (9) (9) (9) (3) (5) (6) - after the
drive is defragmented
A usually fragmented disk will degree the efficiency of a data-recovery,
if e.g. the FAT is overwritten by a quick format or a virus. Then it is
necessary to analyse exactly, how a file scattered over the disk lies.
If however connected data is present, a data-recovery is very quickly
possible on the basis of the information about its position and size.
Important: A non-fragmented disk will increase you
rate of recovery because the complete data is stored at the beginning of
the first cluster of a file.
- Do not store important data on drives with small
capacity
The probability of the recover is lower, the smaller the disk capacity
is. Important data should be saved on a free drive. The smaller the
capacity is, the higher the risk of fragmentation is.
- Defragment your floppy disk, after data is stored
on it
Disks are fragmented with very high probability. Therefore it is
advisable with important data, to distribute the files into several
directories and then defragment the floppy disk.
- Do not use a drive, which you require to the
data-recovery.
Do not install recovery software on a drive that contains data for your
data-recovery. Otherwise data could be overwritten and success on a data
recovery becomes smaller. Avoid working with the drive and do not save
any data on it. Do not use a usal program, including the Windows(R)
Explorer, in order not to overwrite important deleted data.
For the data-recovery you should use a second hard disk.
Error Messages
Description: "Could not write to destination file XXX"
If you are overwriting a prior written file that is
currently opened and used by another software application, it is not
possible to save to this file. Therefore close all other applications
and try again.
Check if there is enough space on the destination
drive and if not, choose another drive or remove unused files.
The file name may contain characters that are not
allowed for saving file names. Rename the file name and try to save the
file again.
Description: "Could not read source file XXX"
The file to be recovered may be too corrupted and
therefore cannot be saved.
Description: "Could not open source file XXX"
The data of the file to be recovered cannot be found
on the disk and therefore the file cannot be saved.
Description: "Could not create directory XXX"
The specified folder cannot be created. Try to save
to another location.
Description: "Error loading INT13EXT.VXD"
Try to copy the .VXD file that can be found in the
POWER RECOVERY program folder into your
WINDOWS \ SYSTEM directory. The message will disappear.
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