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Flash/MicroSD/CF In general Question
Posted: February 7th, 2019, 4:58
by einstein9
Dear Experts... (The experts in NAND recoveries)
Sometimes we receive DEFECTED MicroSD, Flashes and CF memories,
The Question here for you guys is this: Why Windows (for example) reads it as 30mb?
Why 30mb?, why not for example 100 or anything else?... (i have few samples of those)
Anyone knows here?
thank you
Re: Flash/MicroSD/CF In general Question
Posted: February 7th, 2019, 9:16
by ddrecovery
I always presumed it was the size of the controller, but maybe not. That is a good question.
Re: Flash/MicroSD/CF In general Question
Posted: February 7th, 2019, 10:30
by einstein9
ddrecovery wrote:I always presumed it was the size of the controller, but maybe not. That is a good question.
I thought about that, but really 30mb or 100mb of data(instructions) inside the controller is really Huge amount of data (for single flash/mem)
i really cannot find a Tech. Doc. talking about this thats why posted it here...
Maybe one of those knows Sasha/Sergey/Michal i don`t know
still waiting for others opinion but Thx for bringing this here..
Re: Flash/MicroSD/CF In general Question
Posted: February 7th, 2019, 18:37
by HaQue
Had Kingston MicroSD show 31Mb. I have repartitioned some before with this issue and they appeared to work ok after... but I would never use a MicroSD for anything after any time of issue like this. I would hazard a guess that part of the partition table has been corrupted, probably due to degrading NAND, and windows interprets wrong. being SD, it could be a secure digital partition is showing while the normal user partition is gone. Never seen this on anything other than MicroSD cards.
Re: Flash/MicroSD/CF In general Question
Posted: February 7th, 2019, 19:05
by ddrecovery
HaQue wrote:Had Kingston MicroSD show 31Mb. I have repartitioned some before with this issue and they appeared to work ok after... but I would never use a MicroSD for anything after any time of issue like this. I would hazard a guess that part of the partition table has been corrupted, probably due to degrading NAND, and windows interprets wrong. being SD, it could be a secure digital partition is showing while the normal user partition is gone. Never seen this on anything other than MicroSD cards.
I have also seen quite a few standard flash drives with 30mb(ish). When looking at the data in hex it is either all 00 00 or FF FF.
Re: Flash/MicroSD/CF In general Question
Posted: February 24th, 2019, 11:09
by Ronald111
And sometimes it is 2TB...on average non-fake 8GB MSD