ReadyBoost registry hack..!


Sly Dog

Recently, I bought a "Windows Vista Ready UPGRADE" 8GB flash drive.

Surprise, surprise - the write speed of this "Vista Ready" device is too

So, Vista refused to enable ReadyBoost for this device.

I screwed around with it all friggin' day until I found my way to and
figured out the registry's ReadyBoost G-spot!

Windows NT

Here are a few important parameter values:

DeviceStatus 2=ReadyBoost ENABLED 4=ReadyBoost DISABLED

CacheSize Maximum Cache Size is 4090.

DoRetest 0=NO (box checked) 1=YES (box un-checked)

Here's the example of my hack for my defective 8GB flash drive:

CacheSizeInMB ffa (4090)
CacheStatus 1
DeviceStatus 2
DoRetestDevice 0
HasSlowRegions 0
LastTestedTime 1c74d5fcc5dca36
PhysicalDeviceSize 1ebf (7871)
ReadSpeedKBs 12df (4831)
RecommendedCacheSizeMB ffa (4090)
USBVersion 20000 (131072)
WriteSpeedKBs daf (3503)

(*note: I deliberately modified the WriteSpeedKBs value to just in case it
made a difference - the original WriteSpeedKBs value was ~1758)

You can safely delete any and all EMDMgmt "_??" sub-keys to clear out
invalid device speed-test data.

You should restart your system after finalizing your modifications.

Comments, corrections and addendums welcome.



Byron Hinson

While I think some hacks are great news for users, what is the point of
running a ReadyBoost USB stick hack when it means you'll probably actually
end up with reduced performance compared to running Vista without one?

Sly Dog

It's like this:

The problem with this flash drive is the compromised write speed - the read
speed looks pretty normal to me.

Once SuperFetch has written to the cache file, it's pretty much all good
from there.

Byron Hinson

I'm just saying that as your stick tested at 1758, you're actually making
your pagefile (now on the USB stick) slower than sticking with your hard
disk. The idea of using fast USB sticks is that they are faster than the
harddisk at caching, so hacking to enable a slower USB stick actually
degrades performance.

Byron Hinson

What was your original read speed? If its anything below 3500 its not the
best. Example - mine are 8110



Bill Condie

I got a ReadyBoot question.

When I used it, my RAM usage jumped from 50-70%, according to the cute
little guage gadget.

What gives?

Actually, I've wondered forever if it actually does ANYTHING/

R. McCarty

It's a caching utility, it's not going to present you with a big/major %
of performance increase. Plus it takes a "Learning Period" to monitor
and adapt to your PC usage. It's at a performance level between disk
drive access times and physical RAM. Functions like the new Hybrid
disk drives that has Flash Memory for caching.

Bill Condie

<<It's at a performance level between disk
drive access times and physical RAM

I can't see it worth the while . . . just me I guess



Byron Hinson

Got an Apacer one, SanDisk one and a couple of others. Apacer with the
highest mark.