How to reserve space for a file like Explorer does before copying? (Excluding FileStream.Length/Seek)

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How can we reserve space for a file, like Explorer does before copying?

I tried to copy big file to usb-flash and broke a thread, result - 900MB file was created per few seconds, BUT process still running and its existence time is equal to time for copying file.

(Solutions excluding FileStream.Length/Seek, because it's slow on a flash drive.)

Posted 1-Apr-10 10:35am

halabella

Updated 2-Apr-10 7:58am

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KenJohnson · Answer 1 · 2010-04-01T15:30:00

Here is an idea. Why not create the file first and then replace the bytes with the ones from your original file. Here is a link that might help. http://bytes.com/topic/c-sharp/answers/701359-how-create-new-file-fixed-size. Several methods are mentioned and one might have the properties you want.

There could be issues as it might take just as long to create an empty file as to copy one, but I think that this might be worth a shot.

Hope this helps.
Ken

Luc Pattyn · Answer 2 · 2010-04-01T12:41:00

Solution 1

halabella wrote:
reserve space

where? on disk? on the Explorer panel?

Explorer does not reserve any disk space, it checks sufficient disk space is available, however if that fills up due to some other activity the copy process will still fail.

:)

Posted 1-Apr-10 12:41pm

Luc Pattyn