Flash Extractor
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ECC
NAND flash memory is not perfect
Some memory cells can be broken
And when you read data some bits will have wrong values

ECC (Error Correction Code) protect data
It can detect when data have wrong bits (ECC = Check)
And can fix this bit to original valyes (ECC = On)

ECC can fix limited number of bits
For example, 20 bit errors
If sector have 25 errors, then ECC can not fix and sector will be marked as red

When you set ECC = Off, we do not check at all
All sectors marked as green

Mode




Completely disabled
Maximum performance
Use this mode for search


Check only
Average performance
Use this mode to look ECC map


Error correction enabled
Slow performance
Use this mode to save files



Type




Show data ECC map


Show system area (SA) ECC map



Processor Cores



This is number of processor cores used by software to check ECC

It will increase speed of next operations:
- ECC Fix
- ECC Combine
- Save Image (if ECC errors was not fixed before)

It will decrease speed of next operations:
- select new layout
- auto find layout with ECC = Check
- auto find layout with ECC = ON

Each layout require different memory size to use core
For example layout 20-82-00511-1 14_2048_230 Xor C634_32I:
1 core  - 132 MB
2 cores - 263 MB
8 cores -   1 GB

Win32 applications have 2GB memory limit
Thats why number of cores is limited

Performance tests

Read only / WriteBack




Read only mode. Fix errors in memory


Write corrected sectors to dump



ECC Fix



Fix ECC errors in all dumps



ECC Combine



If there is uncorrected errors on ECC map, you can reread one or all dumps in separate folder. And run this procedure to take good sectors from new dumps and write them to main dumps.

Folder - folder with new dumps

Fix Input - Fix errors in input dumps

Fix Main - Fix errors in main dumps



ECC Reread

This operation removed



If there is uncorrected errors on ECC map, you can reread chip several times. Good readed sectors will be writed to dump.

Chip - Number of chip in reader

Banks - Select wich banks will be rereaded

Repeat - number of attempts

Fix main - Fix errors in main dumps, if this was not done before


I do not recommend use this procedure. Better use ECC Combine. There you can check quality of input dumps before join. Because memory chip can give wrong data or zeros in case of bad contact or low voltage. And your main dumps will be destroyed.



Calc statistics



Will give you information about red and green sectors in selected dump

Last added
FC1179   45 3c 98 b3   1x1   v2 20-82-00709-A0 TLGA60 128GB   45 48 a7 93   1x1 Monolith USB_129   45 3e 98 b3   1x1 CBM2199E   ad 3a 14 03   1x2 Monolith Micro SD_64   98 3c 98 b3   1x1 IS918M   2c a4 08 32   1x1 AU6998SN   2c 84 64 54   1x1   Ref Monolith SD_45   ec 3a 94 43   1x1 FC1179   45 3c 98 b3   1x1 SM3257-AA   ec d7 98 ca   1x2
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