There are several companies that make solid state hard drives, I was able to play around the samples, they seem to respond quicker then the disc hard drives.
I had a concern on the sustainability of memory over the lifespan of the device, most flash chips I am aware of have a read/write life span of 100,000 cycles. I am just wondering how long will it actually last before their is a failure
I notice that that if I had something programed on to the flash hard drive to perform a specific function at a certain time every day, then deleted the program. It some how remained in the memory and continued to execute the specific function. Anybody have a clue on what might cause it? Bear in mind, the program is no longer visible the "LS" command
On Jan 13, 2008 4:58 PM, Earle Beason [email protected] wrote:
There are several companies that make solid state hard drives, I wasable to play around the samples, they seem to respond quicker then the disc hard drives.
I had a concern on the sustainability of memory over the lifespanof the device, most flash chips I am aware of have a read/write life span of 100,000 cycles. I am just wondering how long will it actually last before their is a failure
Most flash controllers do have a reserve of blocks for bad block management so even if a block suffers a failure you might not notice as it will be remapped. I would think that though an individual block might have a life span of 100,000 writes (which is the low end of current hardware as I understand) it will be a very long time until the device runs out of reserve blocks.
Jon.
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Jon Pruente wrote: | On Jan 13, 2008 4:58 PM, Earle Beason [email protected] wrote: |> There are several companies that make solid state hard drives, I was |> able to play around the samples, they seem to respond quicker then the |> disc hard drives. |> |> I had a concern on the sustainability of memory over the lifespan |> of the device, most flash chips I am aware of have a read/write life |> span of 100,000 cycles. I am just wondering how long will it actually |> last before their is a failure | | Most flash controllers do have a reserve of blocks for bad block | management so even if a block suffers a failure you might not notice | as it will be remapped. I would think that though an individual block | might have a life span of 100,000 writes (which is the low end of | current hardware as I understand) it will be a very long time until | the device runs out of reserve blocks.
Particularly since pretty much any flash based device like a HDD, CF card, SD card, etc. does hardware based wear-leveling these days. The overall lifetime is a function of the device size, the minimum guaranteed number of rewrites (and 100K is towards the low end these days), and the rate at which you're writing to the media.
If you're using raw flash chips in an embedded product you do have to worry about sector wear, but that's what all those flash file-systems in the kernel are for. :)
- -- Charles Steinkuehler [email protected]
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Charles Steinkuehler -
Earle Beason -
Jon Pruente