[maemo-users] Limited life of flash memory

From: kenneth marken kemarken at broadpark.no
Date: Tue Dec 2 01:01:00 EET 2008
On Monday 01 December 2008 23:35:24 Sirio Negri wrote:
> Hi all! I found some days ago a few articles about the limited life of
> flash memory, specially for usb pendrive. The problem seems to be the
> limited times you can write on it. Does it exist also for rs-mmc?
> I know that the limit is very high (around 10 million of times) and it's
> not a big problem for a normal user. But if you install an OS on it,
> like on my Nokia 770, I think that the use of the memory card is bigger
> and, if there is that problem, its life is shorter.
> Thanks all for any info on it.
> Sirio Negri

iirc, the math goes something like this:

take the space of the card, divide by write speed, thats how long it will take 
(in seconds) to do a write of the whole card.

a 4GB card at 2MB pr second will take about half an hour to do a full write...

now, if the card has a write limit of 10 million, that means it will take 
about 5 million hours...

thats about 580 years of continual writing...

yes, there are some cheap chips out there with poor wear leveling (meaning 
that one can burn out a single sector by repeatedly writing to it), but i 
suspect no name brand card will be that poorly made.

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