Craig wrote:
But what about the few cells an operating system writes over and over,
many times each day? How many bytes is that 100 GB of writes per day to,
the whole solid-state disk, or a smaller subset?
The O/S doesn't get to decide, it's handled by the drive's internal controller.
It's spread over the area of the disk that does not have data stored on it.
You can fill a SSD with data if it's used as a read only drive and it will live
virtually forever. If any writing/deleting is to occur, you can kill the drive
quite quickly by keeping it 99% full. (but usually the drive holds about 7% of
the flash RAM in reserve to keep you from doing that to it, hence the 64GB
drives that hold 55GB of data)
Regaining deleted file space works best if the O/S supports TRIM, or if the
drive controller has very good garbage collection. Kingston made a drive for
Apple that had very aggressive garbage collection, but I forget which one it
was. The issue is that data is written in much smaller blocks than it is
deleted, so when a block is mostly empty, the drive should move the remaining
data to another block and erase the original block so that it may be reused.
Mitch.
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