ReadyBoost is an excellent feature which was introduced with Windows Vista, and later with Windows 7. You can use your external volumes as disk cache space. This can be done with Flash Drives, SD cards and external hard disk drives. ReadyBoost can be used on one device under Windows Vista, but you can add additional devices to Windows 7. NTFS volume should be used as this will give you enough space to serve as your disk cache. office.com/myaccount
ReadyBoost Requirements
To be able to use the device as a ReadyBoost aid, there are some requirements.
ReadyBoost requires that the minimum size of your external volume be at least 256MB. Once it has been formatted, 250 MB would be sufficient. Windows Vista's maximum size was 4GB. It has since been increased to unlimited by Windows 7.
Up to eight devices can be added to increase the total denomination to maximum 256GB. This additional memory would allow you to control many applications with complete control.
Access time should be very short. To ensure that the device can be used quickly, it should take less than 1ms.
The read speed must be at least 2.5 MB/sec, while the write speed should not exceed 1.75MB/sec.
Advantages:
People with low memory or processes that require more memory can expect amazing results. This was first tested on a system that had 512 Mb of RAM. It was the minimum requirement for Windows Vista. The ReadyBoost doubled the amount of ram. The entire process took just 11.7 seconds and was completed in 2 seconds. office.com/setup