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This older device is fast enough to use for occasional file transfers, but those read speeds are way too slow to deliver any performance benefit to a Windows Vista PC. It fails.
This 1GB drive from A-Data, purchased from an online outlet store, just failed to clear the minimum required write speed on the first test pass.
After retesting the previous drive, write performance cleared the minimum threshold, but this drive couldn't deliver that speed across the entire drive. Its design uses a single fast 128MB flash chip matched with slower flash chips. Because it couldn't deliver consistent results, ReadyBoost refuses to use it.