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#WHAT IS READYBOOST WINDOWS 7 PORTABLE#
#WHAT IS READYBOOST WINDOWS 7 WINDOWS 7#

This recommendation should not be confused with the message that is displayed in the “ReadyBoost” tab of drive properties dialog: for example, for a flash drive of 16 GB capacity formatted as FAT32 it will display a message that “Windows recommends reserving 4094 MB for optimal performance” even if RAM size is 10 GB, just because 4094 MB is the maximum file size on a FAT32 volume after reformatting it as NTFS or exFAT, the message changes to “Windows recommends 15180 MB”. Microsoft recommends the amount of flash memory for ReadyBoost acceleration be one to three times the amount of random access memory (RAM) in your computer.Simply mounting as a subfolder of another drive won’t suffice, as only the root folder of a drive is suited for ReadyBoost cache - otherwise the “ReadyBoost” tab will not appear in the logical volume properties, nor will any previously created cache file be used. Because ReadyBoost stores its cache as a file rather than directly using the flash device in a raw manner, that file system must be mounted and assigned a drive letter.

#WHAT IS READYBOOST WINDOWS 7 WINDOWS 7#

Windows 7 supports multiple flash drives for ReadyBoost.

The initial release of ReadyBoost for Windows Vista supports one device.

Due to the fact that ReadyBoost cache is stored as a file, one has to format flash drive as NTFS or exFAT to use more than 4 GB of space for caching, because FAT16 and FAT32 impose file size limit of 2 and 4 GB respectively.

Vista SP2 does not support ReadyBoost for exFAT file system. Windows 7 also supports the new exFAT file system.

Vista SP1’s ReadyBoost supports NTFS, FAT16 and FAT32.

The device must be capable of 2.5 MB/s read speeds for 4 KB random reads spread uniformly across the entire device, and 1.75 MB/s write speeds for 512 KB random writes spread uniformly across the device.

The device must have an access time of 1 ms or less.

Windows 7 allows up to eight devices for a maximum of 256 GB of additional memory.

Windows Vista x86 & 圆4 is limited to using 4 GB this restriction has been removed in Windows 7.

The removable media’s capacity must be at least 256 MB (250 MB after formatting).

ReadyBoost compresses and encrypts, with AES-128, all data that is placed on the flash device Microsoft has stated that a 2:1 compression ratio is typical, so that a 4 GB cache could contain upwards of 8 GB of data.Īccording to Jim Allchin, for future releases of Windows, ReadyBoost will be able to use spare RAM on other networked Windows PCs.įor a device to be compatible and useful it must conform to these requirements: When a compatible device is plugged in, the Windows AutoPlay dialog offers an additional option to use the flash drive to speed up the system an additional “ReadyBoost” tab is added to the drive’s properties dialog where the amount of space to be used can be configured.250 MB to 256 GB of flash memory can be assigned (4 GB in the x86 versions of Vista).

Flash devices typically are slower than a hard disk for sequential I/O so, to maximize performance, ReadyBoost includes logic that recognizes large, sequential read requests and has the hard disk service these requests. This caching applies to all disk content, not just the page file or system DLLs. Using ReadyBoost-capable flash memory (NAND memory devices) for caching allows Windows 7 and Vista to service random disk reads with performance that is typically 80-100 times faster than random reads from traditional hard drives. ReadyBoost is also used to facilitate SuperFetch, which allows it to perform analysis of boot-time disk usage patterns and creates a cache which is used in subsequent system boots.

#WHAT IS READYBOOST WINDOWS 7 PORTABLE#

It works by using flash memory, a USB flash drive, SD card, CompactFlash, external hard drive or any kind of portable flash mass storage system as a drive for disk cache. ReadyBoost is a component of Microsoft Windows, first introduced with Microsoft’s Windows Vista in 2006 and bundled with Windows 7 in 2009.