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I tested this collection of USB flash drives, collected over the past several years, to see which ones would work with the new ReadyBoost memory caching feature in Windows Vista.
Credit: Ed Bott
When you insert a flash drive into a USB port, Windows Vista loads a driver for it and then offers you this choice. Click the bottom option (Speed up my system) to test the device and quickly see whether it's fast enough for ReadyBoost.