unmounting removable disk took a long times
kassube at gmx.net
Sun Jun 17 19:59:24 UTC 2007
> When I unmount any removable media like flash disk, MMC, etc. It took
> a long time. sometime it itook more than a minute or two to unmount
> the drive.
> This is usually happen after I copy file to/from the drive. But if I
> didn't do anything or if I give sometime after copying to/from the
> drive before unmounting it, the problem doesn't occur.
When you copy data to a medium, it is not written immediately, but is
first kept in memory. It is written do the medium when there is no memory
left or after a short delay (30s?). This behaviour is used to speed up
the writing of data, if there are many small files.
If you unmount the medium, the data are immediately written from memory to
the medium. Depending on the write speed of the medium and the cached
data, that can take a long time. If you have a USB stick with an
indicator LED, you can watch this behaviour. However, there should not be
a delay if you only copied files FROM the medium.
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