ReadyBoost will not use more than 2 GB 'Cache space used' on 4 GB ReadyBoost.sfcache file

Windows 7 64 bit on a computer laptop 4 GB.

I have a card SD of 2 4 GB dedicated to ReadyBoost, connected via USB2.   I tried to format the card as NTFS and exFAT and in both cases, Windows may correctly fill in the card with a ReadyBoost.sfcache file, which is about 3.8 GB (card is dedicated to ReadyBoost).
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(Pasted image in - did not show when I introduced first)

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The problem is that no matter how long the system running, perfmon displays 'Cache space used' is always less than 2 GB.
He goes up regularly in the first ten minutes after enabling readyboost, then levels: less than 2 GB:

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(Pasted image in - did not show when I introduced first)

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(Of course the "put bytes in cache" are greater because of the compression.)   But it seems to use only about 1/2 of the 4 GB cache file.
I tried to adjust to only use a 2000Mo cache file size, and then 'Cache space used' would not exceed 1.4 GB.

Am I something wrong or bad what do the numbers mean or is it an inherent limitation of ReadyBoost due, for example, General fresh metadata in the cache file?

As I frequently have max on my use of memory and I can not install more than 4 GB, I had significant performance gains when he might have already spent several minutes, beating the pagefile.   I hope to see even more benefits with a bigger Readyboost cache if possible.   I would also like to solve this problem before investing in a larger and more efficient card.

Thank you and best regards,

Hi Jeff,

In some situations, you might not be able to use all of the memory on your device to speed up your computer. For example, some flash memory devices contain both slow and fast flash memory, but ReadyBoost can only use fast flash memory to speed up your computer.

http://Windows.Microsoft.com/en-us/Windows/using-memory-storage-device-speed-computer#1TC=Windows-7

Computers with discs hard fast (such as 7 200 or 10 000 rpm disks) could achieve minimum performance gains due to the already high disk i/o ReadyBoost. will read the files from the cache only when this so will improve performance. Hard drives surpass flash in sequential reading drives, but flash drives are faster when no sequential reads (because of the latency caused when the drive head must move to a different disk sector). As a result, ReadyBoost reads from the cache only for non sequential reads
http://TechNet.Microsoft.com/en-us/magazine/ff356869.aspx

Hope the helps of information.

Tags: Windows

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