In this case, any data could be in the flash device, since anything that is getting stored into the secondary storage is copied to the flash-based drive. Maybe what is being read is also cached, but it is not stated clearly in the text. After that, the Ecache.sys would monitor the reads and writes to the hard disk and copy any data being written into the cache file. Mark Russinovich says that ReadyBoost asks SuperFetch to prepopulate the cache file created in the flash drive. If that is the case, the ReadyBoost drive would hold data selected by SuperFetch, data that is less important to be in RAM, and crash dump when needed. |9| We may assume that it also holds the data picked by SuperFetch based on how Matt explains the relation between both technologies: he says that ReadyBoost interacts with SuperFetch because the program-usage data is saved in the page file when there is not enough RAM, thus, by saving a copy of the virtual memory in the flash drive, ReadyBoost is also copying the cache created by SuperFetch, but not only that. |8| Besides that, the virtual is also used to store all the content from the RAM in the situation of a system crash.
This allows the computer to prioritize physical memory to data that is more important at the moment. This memory is used to overcome RAM shortage by temporarily holding some data from the RAM into a HDD, or whatever is being used as the secondary memory. |5| |6| |7|īased on some research I get that virtual memory is a technique that allows the use of a portion of the secondary memory like a primary memory.
#WHAT IS READYBOOST CACHE FILE WINDOWS#
The extension of this file (.sfcache) seems to refer to the SuperFetch feature.ĭespite the slightly differences in the information, they all seems to suggest that ReadyBoost places the data that SuperFetch thinks the user is going to need next into the flash drive, In this case, every single data in the flash drive would be there because it has been chosen by the SuperFetch feature.Ģ - ReadyBoost make a complete copy of the virtual memory (page file) Īccording to Matt Ayers, who is referred to as the owner of this feature in some texts posted at the time of Windows Vista, and a post in the old Windows Vista Team Blog, the ReadyBoost technology copies the virtual memory (page file) content to the flash drive.
#WHAT IS READYBOOST CACHE FILE WINDOWS 7#
|3| An overview of the Windows features used to improve performance in Windows 7 says that ReadyBoost “provides a dedicated area where SuperFetch can securely store a copy of performance-crucial data.” |4|Īlso, ReadyBoost creates a cache file named readyboost.sfcache into the flash-based device. |1| On TechRepublic a slightly different function is given to ReadyBoost: instead of storing into the flash-based external memory prefetched data that would go to the RAM, it redirects prefetched data that would go to the virtual memory into flash drive, |2| Michael Fortin, who led the Windows Client Performance Team at the time SuperFetch and ReadyBoot were developed, said basically that ReadyBoost is intended to manage “SuperFetched” data in a flash device. |1| |2| |3| |4| Though, I think it also stores some data in the virtual memory when there is not enough RAM to accommodate all of it.Īccording to a text on HowToGeek, the ReadyBoost would work with SuperFetch by loading the data selected into a flash drive instead of occupying the RAM with them. Knowing this information, it may load data into the RAM before the user needs it. SuperFetch is explained as a kind of limited artificial intelligence created to identify patterns on the user activity, so it may predict what the user is going to do in a given time. Some sources suggest that ReadyBoost works alongside another Windows feature: SuperFetch. Searching through the web I came to three possible answers:ġ - ReadyBoost stores the data picked by SuperFetch However, I still don’t understand what data ReadyBoost stores on the flash device. I get that it stores some data into a flash drive so they may be accessed faster, sent to the RAM, and then used by the CPU. I am trying to understand the ReadyBoost feature that is still available in Windows 10.
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