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SD Flash Doctor - the ultimate solution for Flash Data
Recovery
More details about Flash Data Recovery
Doctor, please kindly visit our new site:
http://www.sd-flash.com
SD Flash Doctor – Complete Stand-Alone
Software-Hardware Complex
Purpose
SD Flash Doctor is a professional tool for
flash data recovery from damaged flash media (both physical
and logical problems). This is an advanced stand-alone flash
data recovery kit contains hardware and software: the
hardware helps to access the flash chip contains user data
despite of damaged controller or any other front ends (PCB,
etc.) using non-standard interface and command, and then
extract all the data as an image; the software works on this
image and helps to rebuild the data which is doomed to be
corrupted because of the "Data Mix" technology used by the
manufacturers, Flash Data Recovery Doctor uses unique
algorithm which removes the data mix with no need to
know/use/emulate/analyze the controller. That’s to say,
Flash Data Recovery Doctor "removes" the data mix directly.
Amazing? Please read on.
Supported Devices
Flash Doctor supports all NAND-based flash
storage devices (SD, SM, MMC, XD, USB Pendrive, MemoryStick,
CompactFlash etc.), with damaged controller or any other
front ends (PCB, etc.) since Flash Data Recovery Doctor
needs to work on the flash memory only when users carry out
Flash Data Recovery.
Flash Doctor Hardware – Flash Reader
Basically, flash storage devices are made up
by two major parts: the front end (mainly the controller
chip and the PCB) and the flash memory chip. PCB ensures the
proper functioning of the device and it seldom damages
itself; Controller chip for the flash device is more like
the SA for the hard drive, it is responsible for the "Data
Mix" and defect list (where the user data should/shouldn’t
be written/read among the pages of the memory chips) and
some other functions like BIOS; Memory chips are only used
for user data storage, where the files and file system are
stored.
Just like SA of the hard drive, the
controller chip operates each time the users plug their
flash devices, so it is also the reason that causes flash
devices problems, cases are controller chip damaged or
burnt, content corruption, etc., which make the access to
the contents of the flash memory chips impossible by the
standard interface realized by the original front end. SD
Flash Data Recovery Doctor contains specialized hardware,
the Flash Reader, for unsoldering memory chips and reading
their raw data using its NAND-friendly adaptor.
Unlike existing similar flash data recovery
products, SD Flash Data Recovery Doctor uses separated
design for its flash reader: the flash adaptor is separated
from the main console, which makes the adaptor add-on and
replacement possible. Users do not need to purchase another
console when we upgrade the flash chip support; it saves the
users a lot.
Flash Doctor Software – File Structure
Emulator
What other flash products do for Flash
Recovery?
From the above, we have already known that
the controller chip is responsible for the order data is
spread among the memory chips (known as data mix); therefore
those existing similar flash data recovery products are
doing in the following way: to set the data to readable
format (rebuild) by emulating controller actions. It’s a
reasonable way of solution because when the data order was
restored, then of course it is possible to proceed flash
data recovery since the controller is "virtually repaired".
What’re the disadvantages?
In order to emulate controller actions, those flash data
recovery tools manufacturers have to dig into every
controller they want to add flash data recovery support to,
this causes two problems:
1. Flash data recovery in such a way takes
time to add the controller support since the analysis
towards the controllers is not to be done very fast; what’s
more, there are more than a thousand of controller types,
not to mention that there will be different contents even
for the same type of controller. So it will be very limited
support and very slow in the upgrade for such kind of flash
data recovery tools.
2. Sometimes the result of the flash data
recovery carried out in such way was not correct, or even
data can’t be recovered by the means of emulation by
controller types. Like we said, there will be different
contents even for the same type of controller caused by
different manufacturers or production dates.
How does SD Flash Doctor Software get rid of
the "data mix" and rebuild the files?
Flash Data Recovery Doctor File Structure
Emulator removes the "data mix" by analyzing the logical
links among the data spread in the blocks. We know that
because of the data mix, files are not stored linearly on
the pages but in a dynamic unknown order decided by the
"wear-leveling" algorithm running in the controller chip;
without the controller, the files are corrupted because we
don’t know the spread order. The Flash Data Recovery Doctor
Software, File Structure Emulator, with the unique
algorithm, is able to chase the internal logical links of
the spread data by analyzing the file information and
rebuild the entire file; this "rebuild" is not realized by
emulating the controller action.
What’re the advantages?
We do not need to deal with the controllers,
but the flash chips only; this allows the users to:
1. Much easier and direct in flash data
recovery, just do it in one two three: one, unsolder the
flash chip; two, read the raw data; and three, chase and
rebuild the data.
2. Without the born-limit of the controller
emulating means, Flash Data Recovery Doctor supports all
NAND flashes in its birthday, despite of what kind of
controller they use.
Automatic and manual modes
Each of the flash chips has its own data
order arranged by the controller, therefore the channel of
the internal logical links of the files are different. SD
Flash Data Recovery Doctor File Structure Emulator analyzes
and chases the internal links in real time automatically and
shows the settings and parameters used; users are allowed to
review the result of the rebuilding quick and safe in the
software without influencing the raw data, so that users can
decide what to do next.
Moreover, if the internal links can’t be
worked out via Automatic Mode, the File Structure Emulator
allows users to try to analyze and chase the internal links
via Manual Mode, by setting the flash chip parameters,
analysis mode and chase parameters then applying them to the
raw data read by the Flash Reader.
Database
Database with Controller "Data mixes"? Well,
we DO NOT need that because we use our unique algorithm to
rebuild the data directly from the flash chip,
controller-independent.
SD Flash Doctor SUITE
Contains:
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SD Flash Data Recovery Doctor hardware,
including:
Stand-alone NAND Adaptor (adaptors for other flash
microchips to be added on soon)
Central Processing Console (USB Flash Reader)
-
SD Flash Data Recovery Doctor software
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Console-PC USB cable
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User manual with data recovery case
studies.
MAIN PRINCIPLES AND FEATURES OF FLASH DATA
RECOVERY FROM THE FLASH STORAGE DEVICES
How to Perform Flash Data Recovery Using SD
Flash Doctor
If the flash storage device generates the
following problems:
1. Logical problems, such as file system
damaged and file deleted.
2. Bad blocks in flash chip; in such case,
the flash device can be detected in your system but isn’t
working properly or its status is unstable.
3. Device can’t be detected in your system at
all.
4. The flash device can be detected and
accessed smoothly, but all data read out is meaningless.
By performing the next steps with the help of
SD Flash Doctor kit, it can help you to get the data from
it.
1. Unsolder all flash memory chips (if
multiple-chips applied) of the device using the soldering
station and necessary toolkit.
2. Extract raw data as one file from all
flash memory chips (one for each, if multiple-chips applied)
with SD Flash Doctor hardware, the Flash Reader.
3. Import all raw data files (if
multiple-chips applied) to the Flash Doctor Software, the
File Structure Emulator, for analysis operation. In
Automatic Mode, utility will automatically do all operations
to recover the data, no setting needed at all. If the
utility cannot build any suitable file structure model
automatically using the algorithm, you can activate the
Manual Mode, which allows you to adjust and set all the
parameters for the rebuilding process and recover the data
by trial and error.
4. Browse the file tree, save files you need to a new
location.
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