Re: File Copy Without Win Buffering

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"Larry Serflaten" <serflaten@xxxxxxxxxxxxxx> wrote in
news:e9onknHJGHA.2036@xxxxxxxxxxxxxxxxxxxx:

>
> "DanS" <t.h.i.s.n.t.h.a.t@xxxxxxxxxxxxxxxxxxxxxx> wrote
>> >> I want to know that the fle got to the destination device so when
>> >> I read it back I am getting it from the device not from Windows
>> >> buffers as I am now.
>> >
>> > How do you tell if you are reading from a buffer?
>> >
>> If it's a floppy it is very easy to tell.
>>
>> Put in a floppy, open Windows Explorer to the floppy drive. Doulble
>> click to open a file on the floppy. This will take a few seconds.
>> Close the file. Double click to open the file again. This time it
>> opens in 1/2 second or less. Reading from cache.
>
> Still that is a guess, there is no other indication where that data
> actually came from. I could likewise say that access time is governed
> by the speed of the drive arm and its ability to be quickly positioned
> over the data. The first read requires the arm to hit the disk's FAT
> and then move to the file, while the second read is quicker because
> the arm is still directly over the file data. When you get that
> second copy, doesn't the floppy's busy light still come on? Try a
> larger file if you want to hear the arm move while the second read is
> happening....

OK, a 726K file. First copy to HD, 20 seconds. Second copy the drive LED
is on for 2-3 seconds, but the copy progress bar never comes up. Third
copy 2-3 seconds. If you pop the floppy out the back in the first copy
then again takes 20 seconds.

To me, it seems as though Windows is looing at the file to see if it's
changed, and if not, just using the cache.

DanS
.

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