Robert G. Brown wrote:
On Wed, 21 May 2008, Eugen Leitl wrote:
On Wed, May 21, 2008 at 03:36:24PM +0100, Kozin, I (Igor) wrote:
b) Laptops. I'd REALLY like a flash-driven laptop.
Who wouldn't? But what's the typical lifespan of flash memory?
Current SSDs claim >1 Mh MTBF, largely due to wear-leveling.
A Mh is, lessee, 100 years? So one failure per hundred systems per
year? Or if it is truly due to wear, perhaps it is zero failures per
hundred systems for 50 years, then an increasing failure rate out to
100+?
If it is wear, however, lifetimes may depend on usage, and using it as a
root fs and/or home directory may significantly shorten lifetime.
given a 300,000 cycle rated life span, a solid wear-leveling algorithm,
and a controller that groups and shadows incomplete writes you can write
to a 16GB flash drive at 20MB/s for 9 years before it exceeding it's
warranted cycle life.
It used to be fairly trivial to exercise a given block until it failed,
but by in large that won't happen anymore.
rgb
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