Ready Boost

What is ReadyBoost?
ReadyBoost is a software which acts like your extra RAM or say HARDDISK inthis your operating system uses its free space for windows purpose and this help you to speed up your computer a bit faster.
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ReadyBoost can speed up your computer by using storage space on most USB flash drives and flash memory cards. When you plug a ReadyBoost-compatible storage device into your computer, the AutoPlay dialog box offers you the option to speed up your computer using ReadyBoost. If you select this option, you can choose how much memory on the device to use for this purpose.

To add to this, ready boost stores frequently used data on a flash drive, which typically reads much more quickly than it would from your hard drive. We’ll stick with these explanations now and expound on them in the next section.
Does ReadyBoost Really Work?
In theory, yes. But not for every setup.
In this section, we’ll explore the technical details of ReadyBoost and look at some benchmark tests to help you determine whether ReadyBoost will help you.
The Technical Part
The average random 4K read from a flash device is approximately ten times faster than accessing the same information from your 7200 rpm hard disk drive. As thumb drives can be read very quickly (and even more quickly as we adopt USB 3.0, this makes them a great candidate for storing information that has to be accessed as quickly as possible.) The reason it’s an average time is because there is little to no seek time on a flash drive whereas a disk drive has different seek times depending on how contiguous the data is and how much is being read.
All flash drives are not made equal (ever wonder why some “brand name” drives are 3-4 times the price of ones you can find on eBay?) To work with ReadyBoost, the flash drive must be capable of 2.5MB/sec throughput for 4K random reads and 1.75MB/sec for random writes. How do you know if your current drive is compatible? Plug it in and see if Windows offers the use of ReadyBoost. What about a new drive? Check the next section for the answer to that question.
Benchmark Testing
As I don’t have the equipment to test ReadyBoost, I’ll summarize some data from Tom’s Hardware and suggest you head to the test results article to get a full insight of the effects of ReadyBoost.
This chart shows the time it takes to open Microsoft Outlook 2007 on a machine with 512MB RAM. Each line represents the first, second, and third opening of the program through three cycles (for a total of nine times.)
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As you can see, the more you use ReadyBoost, the more it helps you as it collects information to help you get the most out of the space you allocate for it.
The effects of ReadyBoost are lessened by having more memory.
ReadyBoost is only really good if you have an older, slower system. You may be wasting a good flash drive if you use it on a more powerful machine.
So, Does ReadyBoost Really Work?
The effect of ReadyBoost will be greater if you are on a PC that is currently struggling to keep up with everything you throw at it. Typically, a struggling machine (that’s not infected with malware) has low available memory and runs slow because your hard disk is being thrashed with inputs and outputs (IO) of data the operating system needs available (should be stored in RAM) and historical data used to speed up routine processes.
In other words, if your PC has 512MB of RAM then you’re going to see a big improvement using ReadyBoost. However, you’ll see an even greater improvement by adding more RAM, which for another 512 MB / 1GB can be about the same price as a good quality 4GB flash drive. I’d go with the extra memory (more about that later.)
What are the Requirements for ReadyBoost?
If you’ve decided to use ReadyBoost, the requirements are:

A PC:
With a free USB 2.0 port (or up to eight for Windows 7 64-bit.)
Running Windows Vista or Windows 7.
A flash drive:
Capable of 2.5MB/sec throughput for 4K random reads and 1.75MB/sec for random writes.
Between 250MB and 4GB in size (Vista 32-bit.)
Between 250MB and 16GB in size (Vista 64-bit.)
Between 250MB and 4GB in size (Windows 7 32-bit.)
Between 250MB and 32GB in size and up to eight devices for a total of 256GB (Windows 7 64-bit.)