Difference between revisions of "/tmp/nandTest.dat"
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'''/tmp/nandTest.dat''' is a 25.6MB file created during the factory process to test reading and writing the NAND. It contains a specific pseudorandom pattern. The contents can be downloaded [http://static.hackmii.com/garbage.7z here]. | '''/tmp/nandTest.dat''' is a 25.6MB file created during the factory process to test reading and writing the NAND. It contains a specific pseudorandom pattern. The contents can be downloaded [http://static.hackmii.com/garbage.7z here]. | ||
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| + | While the intention of this program was most likely so that any issues would get printed to [[:/shared2/test2/nanderr.log]], it also has the side effect of overwriting most of the earlier factory remnants with this pattern, making factory analysis more difficult. | ||
Like other contents of [[:/tmp]], it is erased on every [[boot2|boot]] and [[IOS]] reload. | Like other contents of [[:/tmp]], it is erased on every [[boot2|boot]] and [[IOS]] reload. | ||
Revision as of 00:16, 23 August 2021
/tmp/nandTest.dat is a 25.6MB file created during the factory process to test reading and writing the NAND. It contains a specific pseudorandom pattern. The contents can be downloaded here.
While the intention of this program was most likely so that any issues would get printed to /shared2/test2/nanderr.log, it also has the side effect of overwriting most of the earlier factory remnants with this pattern, making factory analysis more difficult.
Like other contents of /tmp, it is erased on every boot and IOS reload.
Algorithm
The following code is used to generate this file:
s32 seed = 1;
s16 rand(void) {
seed *= 0x41C64E6D;
seed += 12345;
return (s16) seed >> 16;
}
u8 getRandomChar(void) {
return rand() >> 8;
}
