ReadyBoost是Windows Vista中的新技术，在继Windows Vista的下一代操作系统Windows 7中，同样包含了这项技术，它利用了闪存随机读写及零碎文档读写上的优势来提高计算机系统性能。它是下一代闪存硬盘的临时替代品。

这项技术目前仅支持USB2.0或更高版本接口的USB闪存驱动器以及计算机内置读卡器中的闪存。具体要求是，4k随机读取的速度大于3.5M/s，512k随机写入的速度大于2.5M/s。

ReadyBoost (codenamed EMD) is a disk caching software component developed by Microsoft for Windows Vista and included in later versions of the Windows operating system. ReadyBoost enables NAND memory mass storage devices, including CompactFlash, SD cards, and USB flash drives, to be used as a write cache between a hard drive and random access memory in an effort to increase computing performance. ReadyBoost relies on the SuperFetch technology and, like SuperFetch, adjusts its cache based on user activity. Other features, including ReadyDrive, are implemented in a manner similar to ReadyBoost.