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Windows 7: Something's Gobbling my Disk space but can't see it

02 Jul 2011   #11
jimbo45

Linux CENTOS 7 / various Windows OS'es and servers
 
 

Hi there
actually reserving a large amount of data for this type of operation is GOOD programming


Since Disk READ is fairly slow - you can speed up the process by reading HUGE chunks of data from the source drive and writing to the target drive "asynchronously".

You can also "re-block" the data to the optimum size for physical data transfer to the output device which might have a totally different specification from the source disk.

This means of course that the output disk can be written to INDEPENDENTLY of the data transfer rate from the source (once you've filled the "Buffer" of course).

If you didn't employ techniques like this you would have to wait to complete a READ from the input device before you could do a WRITE to the output device -- and then you would also have to wait for the OUTPUT device WRITE to have finished before getting the next READ request.

I'd hate to be using a Cash machine if you programmed the I/O to run totally sequentially !!!!!.
It would take from now until AFTER LONODON'S Olympic games in 2012 to just get some cash from a machine programmed like that. !!!!!


It's been DONKEYS YEARS since I did anything with Operating systems but the principle is still the same -- allow as much system throughput as possible CONCURRENTLY.

Cheers
jimbo


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02 Jul 2011   #12
karlsnooks

MS Windows 7 Ultimate SP1 64-bit
 
 

the principle is correct. The implementation is evidently faulty. Hard to believe but the first time I programmed overlapped input, processing, output was back in 1962.
My System SpecsSystem Spec
02 Jul 2011   #13
Britton30
Microsoft MVP

Windows 7 Ultimate X64 SP1
 
 

Now if I knew what you were talking about...
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 Something's Gobbling my Disk space but can't see it




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