|
|
|
Data validation
 |
|
 |
 |
|
 |
|
Validation is not available during image recovery
process. Image recovery process utilizes some algorithms derived from the
validation routines, thus introducing an undesired bias into the validation results. |
|
 |
|
 |
|
|
|
|
|
|
|
|
- The most
significant is that the validation process can not substitute human review, because
there is no way a program can distinguish e.g. between the latest (useful) and
older (worthless) versions of the file.
- On top of that, typical validator does not "truly" read the file.
When possible, validator will skim along the file touching and verifying several
key points in the file. This is presumed the most fruitful approach because of the
following two reasons:
- Validation of some file formats requires excessive computation effort,
which would be impractical unless your other computer is Cray.
- There are way too many file formats out there. Some of these file
formats are fairly complicated. Full-blown reader implementations for all
these file formats would just be cost-prohibitive.
- Some files are in fact a combination of two separate file formats. For
example, a self-extracting archive consists of the decompression module
executable file immediately followed by the compressed archive data. For such
files, the format is checked as specified by the file extension (in the above
example the executable module will be checked, rather than compressed data).
- Some files would be different format from what their extensions suggest. For
example, some files left from the older days have .DOC extension but are in fact
plain text. The validator may try to verify these files as Microsoft Word
format, which is obviously not the case. This will trigger false "validation
failure" indication.
- Not all file formats are supported. Refer to
the full
list of the file formats supported by the validation engine for
details.
|
|
|
|
|
That said, the validation result should be taken with a grain of salt as a
rough approximation of final recovery quality. Zets All Right for hard drives to fail...
|
|
|
|
Weekend discount in effect
32 hours 25 min left
This small piece of software, within minutes of downloading,
made me the happiest guy in the world.
My camera did something weird to my SmartMedia card, rendering it useless.
Upon card insertion, the camera and subsequent computers asked if I wished to format the card.
I did NOT format the card, because I had just spent 2 hours taking promo pictures for my business
in lots of different locations, and figured SOMEbody could figure it out...
[...] When I found this program, although it took a minute or two to figure out which "number"
went with my USB SmartMedia reader, I clicked a few buttons, and this program went right to work.
It took about 5-10 seconds per picture to recover - I was ELATED!
Thank you for providing this piece of software for free.
I figure the least I could do was come back to say thank you.
|
|
