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1.75 MB/sec throughout for 512 KB random writes.2.5 MB/sec throughout for 4 KB random reads.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.
#How to use usb device for ready boost free
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. Follow along in the image gallery that accompanies this post and you'll see how you can measure the performance of your own flash devices. I gathered together more than 20 flash devices I've picked up over the past several years and put them to the test. Carl Siechert, Craig Stinson, and I discovered this fact during our research for Windows Vista Inside Out, and to the best of my knowledge no one has published this information online yet. But the actual numbers are there for all to see, if you know where to look. If you try to use a cheapo USB flash drive that some company passed out at a trade show, you won't know from that initial screen why it failed. When you insert a new flash device and try to use it as a ReadyBoost device, it either passes or it fails. Many of those flash devices will fail, with a message that reads: "This device does not have the performance characteristics for use in speeding up your system.”īut George gets one detail wrong in his post: Unfortunately Vista doesn't report the actual raw data for its ReadyBoost test since it only gives you a pass/fail score making it as useless and confusing as the Vista performance index that's based on a scale of 0 to 6. As he notes, many people are in for a rude shock when they plug in a USB flash drive, Compact Flash card, or SD card and expect it work well with the new ReadyBoost feature in Windows Vista. My colleague George Ou has an excellent rant on flash drive performance.