ReadyBoost: Difference between revisions

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Using ReadyBoost-capable flash memory ([[NAND flash|NAND memory]] devices) for caching allows [[Windows Vista]] and later to service random disk reads with better performance than without the cache. This caching applies to all disk content, not just the page file or system DLLs. Flash devices typically are slower than a mechanical 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.<ref name="QnA">{{cite web|url=http://blogs.msdn.com/tomarcher/archive/2006/06/02/615199.aspx |title=ReadyBoost Q&A |accessdate=2008-01-11 |last=Archer |first=Tom |author2=Ayers, Matt |date=2006-06-02 |work=Tom Archer's Blog |publisher=[[MSDN Blogs]] }}</ref>
 
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 a '''ReadyBoost''' tab is added to the drive's properties dialog where the amount of space to be used can be configured.<ref name="readyboostJim Allchin">{{cite web |url=http://blogs.msdn.com/tomarcher/archive/2006/04/14/576548.aspx |title=ReadyBoost - Using Your USB Key to Speed Up Windows Vista |date=April 14, 2006 |accessdate=2006-05-21 |author=Tom Archer |work=Tom Archer's Blog |publisher=Microsoft}}</ref> The minimum cache size is 250&nbsp;MB. In Vista or with FAT32 formatting of the drive, the maximum is 4&nbsp;GB. In Windows 7 with NTFS or exFAT formatting, the maximum cache size is 32&nbsp;GB per device. Windows Vista allows only one device to be used, while Windows 7 allows multiple caches, one per device, up to a total of 256&nbsp;GB.<ref name="readyboostMarius Oiaga">{{cite web |url=http://news.softpedia.com/news/Windows-7-RTM-ReadyBoost-256-GB-of-Memory-Cache-Support-124081.shtml |title=Windows 7 RTM ReadyBoost 256 GB of Memory Cache Support |date=October 12, 2009 |accessdate=2013-01-09 |author=Marius Oiaga |work=SOFTPEDIA |publisher=SoftNews NET SRL}}</ref>
 
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 a 4&nbsp;GB cache would usually contain 8&nbsp;GB of data.<ref name="russinovich">{{cite web
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