notation for sizes in flash storage; was Memory replacement

[peasthope at shaw.ca]

Arnd Bergmannarnd at arndb.de 
Tue Mar 15 04:42:04 EDT 2011
> (data from my head, easily off by an order of magnitude):
> 
> 	      drive  block  page  erase  w-amplftn  expected life
>            size   size  size  cycles  FAT ext3    FAT    ext3
> 2005 SLC 256 MB  64 KB  1 KB  100000  2      8   13 TB  3.2 TB
> 2005 MLC 512 MB 128 KB  2 KB   10000  2     16  2.5 TB  640 GB
> 2011 SLC   4 GB   2 MB  8 KB   50000  2    512  100 TB  200 GB
> 2011 MLC   8 GB   4 MB 16 KB    5000  2   1024   20 TB   40 GB
> 2011 TLC  16 GB   4 MB 16 KB    2000  2   1024   16 TB   32 GB

That table will be very helpful when I need to reformat a flash store.  Thanks!

According to http://en.wikipedia.org/wiki/Binary_prefix#Flash_drives ,
manufacturers of flash storage devices really do quote capacities in MB, 
GB and TB.

Naively, I'd expect page size and block size, to be powers of 2.  In the 
case of the 512 MB capacity for example, are the block and page sizes 
128 and 2 kB or 128 and 2 KiB?  Incidentally, the correct abbreviation 
for the decimal kilo is k rather than K.

Auxilliary question: is the block referred to in the table the erase block? 
Something else?

Thanks,               ... Peter E.


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