Is Your Flash Drive Ready for Vista?
Read an interesting post from Ed Bott who discovered a way to get numbers when Windows Vista checks a USB drive to see if it is fast enough for Readyboost. You can get the numbers using Event Viewer, if a drive fails the test, click test again, then open event viewer, click the applications and services logs category in the tree to the left, then click Microsoft, Windows and then Readyboost, under the Readyboost heading select operational. The center window will show you performance test results for successful and unsuccessful attempts. He has posted images of the process, follow along here.
To be used as a ReadyBoost device, your flash drive has to pass several tests, including available free space, write performance, and random read performance. When you connect a supported flash device to your system and choose the Speed Up My System option, Windows Vista runs a quick performance test to see if the device meets minimum standards required for ReadyBoost. Those standards are:
2.5 MB/sec throughout for 4 KB random reads
1.75 MB/sec throughout for 512 KB random writes
These results must be consistent across the entire device. In addition, the device must be at least 235 MB in size (although you can designate less than the full space on the drive for the ReadyBoost cache).
If any of these tests fail, the drive is rejected. Source: Is your flash drive fast enough for Vista’s ReadyBoost?
The USB drive out of the 20 or so that he tried was the Apacer Handy Steno 2.0 USB flash drive. He purchased two of those 1GB drives (these are model HT203) for the low price of $24 each a few months ago. Grant Gibson has started lists of the USB drive that pass and the ones that fail