Looks like you read the same technical article that I did yesterday, good man.
David Ferrin Always be yourself because the people that matter don't mind, and the ones that mind don't matter. -----Original Message----- From: JAWS-Users-List [mailto:[email protected]] On Behalf Of Steve Sent: Thursday, February 14, 2013 12:13 PM To: [email protected] Subject: Re: [JAWS-Users] ready boost Dave, Not sure if you saw this regarding readyboost. For those who may not be familiar with it, the core idea of ReadyBoost is that a flash drive (aka USB thumb drive or USB memory stick) has a much faster seek time than a typical magnetic hard disk (less than 1 ms), allowing it to satisfy requests faster than reading files from the hard disk. It also leverages the inherent advantage of two parallel sources from which to read data, whereas Windows 7 enables the use of up to eight flash drives at once, allowing up to nine parallel sources. USB 2.0 flash drives are slower for sequential reads and writes than modern desktop hard drives. Desktop hard drives can sustain anywhere from 2 to 10 times the transfer speed of USB 2.0 flash drives but are equal to or slower than USB 3.0 and Firewire (IEEE 1394) for sequential data. USB 2.0 and faster flash drives have faster random access times: typically around 1 ms, compared to 8 ms and upwards for desktop hard drives. On laptop computers, the performance shifts more in favor of flash memory because laptop memory is more expensive than desktop memory and many laptops have relatively slow 4200 RPM and 5400 RPM hard drives. Although devices are tested for ReadyBoost compatibility when they are plugged in, compatibility can also be tested manually: Windows Vista and Windows 7 include a command-line utility called WinSAT.exe (standing for Windows System Assessment Tool) to test the performance of random read and write speeds. For a standard Windows installation, it can be found in a sub-directory of C:\Windows\system32. The Command Prompt must be run with administrative privileges, otherwise test results will not be visible after testing. According to the Microsoft TechNet, the syntax is as follows: To test random reads (4096 for 4 KB): winsat disk -read -ran -ransize 4096 -drive driveletter For random writes (524288 for 512 KB): winsat disk -write -ran -ransize 524288 -drive driveletter A system with 512 MB of RAM (the minimum requirement for Windows Vista) can see significant gains from ReadyBoost. In one test case, ReadyBoost speeds up an operation from 11.7 seconds to 2 seconds (conversely, increasing physical memory from 512 MB to 1 GB without ReadyBoost reduced it to 0.8 seconds). System performance with ReadyBoost can be monitored by Windows Performance Monitor. ----- Original Message ----- From: "David Ferrin" <[email protected]> To: <[email protected]> Sent: Wednesday, February 13, 2013 2:29 PM Subject: [JAWS-Users] ready boost >I found after just a bit of research that my test yesterday did not meet >the minimum requirements for ready boost to work properly. According to my >findings at least a 1 to 1 ratio of flash memory to system memory is >required with a maximum of 2.5 to 1 ratio. For example if your system has 4 >GB of memory you should use at least a 4 GB flash device and as I >understand the upper limit the same system could handle a flash memory >device up to 10 GB. It would seem that anything more or less is not a valid >option. One article said something about optimal flash memory is double the >system memory. So in short an 8 GB device for a 4 GB system. > > I do have an 8 GB flash drive which mathematically sounds like it will > work fine with my 3 GB lap top, results to follow when I find out what > they end up to be. > David Ferrin > Always be yourself because the people that matter don't mind, and the ones > that mind don't matter. > For answers to frequently asked questions about this list visit: > http://www.jaws-users.com/help/ For answers to frequently asked questions about this list visit: http://www.jaws-users.com/help/ For answers to frequently asked questions about this list visit: http://www.jaws-users.com/help/
