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Windows 7: Boost Windows 7 SP1 USB Storage Devices Performance by Increasing Maxi

14 Aug 2011   #21
arkhi

Windows 2000 5.0 Build 2195
 
 

@Airbot

There was a mention of a requirement to create a registry key even though people siad "There wasn't". That's the point. Oh, and also the point that MS said that VVVV and PPPP are variables, not an actually key itself.


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14 Aug 2011   #22
Teerex

Windows 7 x64 Ultimate SP1
 
 

Guys, guuys, this is probably something that will make sense only with USB 3.0, and the vendors will enable it by setting the registry keys with their inf files.
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14 Aug 2011   #23
bagavan

Windows 8 Professional x64
 
 

Is it necessary to manipulate the registry???
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14 Aug 2011   #24
Airbot

Windows 7 Ultimate x64 SP1
 
 

Quote   Quote: Originally Posted by arkhi View Post
@Airbot

There was a mention of a requirement to create a registry key even though people siad "There wasn't". That's the point. Oh, and also the point that MS said that VVVV and PPPP are variables, not an actually key itself.

Actually, there isn't.

It says locate the subkey VVVVPPPP, and then create a new dword value inside of it. Doesn't say create the VVVVPPPP subkey itself at all.
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14 Aug 2011   #25
TBoyd

Windows 7 Professional 64 Bit SP1
 
 

I downloaded this hotfix in hopes that it would increase the data transfer rate of image files from a 8GB UDMA CFII card via a Lexar USB 2.0 reader. It created no improvement at all.

When I navigated to the HKLM\SYSTEM\CurrentControlSet\Control\usbstor\VVVVPPP subkey, I only found 4 different idVendors & id Products - none of which were my Lexar card reader. The USBSTOR for the Lexar is located in HKLM\SYSTEM\Control Set002\Control\DeviceClasses\{......} - So I hesitate to edit anything there.

I also have a virtual disk, so there is USB virtualization listed in my device manager as well.

I'm leaving this hotfix alone for now. - Not enough information from MS.
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14 Aug 2011   #26
MilesAhead

Windows 7 32 bit
 
 

Quote   Quote: Originally Posted by xxxdannyxxx View Post
Quote   Quote: Originally Posted by Airbot View Post
What's your point?



Ive tried now on several Hdds and Usbs and none show any significant increases at least on my devices

Danny
If they are blocking employee access to porn sites at Redmond then the guys probably need something to keep them awake.

edit: btw I have SIIG USB 3.0 Express card and if you factor in that Crystal Disk Mark considers 1000 KB a MB my quad core does sequential read at the rating of the WD caviar black 6 Gb/s drive. Namely around 126 MB/s (Crystal Disk Mark reads in the 130s since they consider 1000 kb a MB.)

My dual core with W7 reads and writes on a par with the capacity of the system drive. Typically sequential writes from the system drive to the HD in the USB 3.0 dock are in the 70 something MB/s range.. which is the capacity of the sending drive. I don't think there's any need to tweak it.
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14 Aug 2011   #27
Mercurial

Windows 7 32bit RTM
 
 

Its a trap!
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14 Aug 2011   #28
GeneO

Windows 10 Pro. EFI boot partition, full EFI boot
 
 

Quote   Quote: Originally Posted by xxxdannyxxx View Post
I looked at this a day or so ago but never had the VVVV/PPPP subkey even after installing the hotfix so didnt bother

Attachment 170137

Danny
The article says that for the ubstore/VVVVPPPP, the VVVV and PPPP are hexidecimal values that describe a USB device. In your case, ubstor/054C00C1 is one such USB device for which VVVV=054C and PPPP=00C1. So if you want to increase the transfer size for this device, you create the MaximumTransferLength dword in ubstor/054C00C1.

You don't literally create a ubstor/VVVVPPPP key and then create MaximumTransferLength in it. That will not do anything.
My System SpecsSystem Spec
14 Aug 2011   #29
arkhi

Windows 2000 5.0 Build 2195
 
 

Yup, because looking back at the KB article:
Quote:
  1. Locate and then click the following registry subkey:

    HKLM\SYSTEM\CurrentControlSet\Control\usbstor\VVVVPPPP
VVVVPPPP are italicized, which obviously means those are variables, not to mention the note below it that says they represent hexadecimal values.
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15 Aug 2011   #30
MilesAhead

Windows 7 32 bit
 
 

Quote   Quote: Originally Posted by Mercurial View Post
Its a trap!
And the cheese smells moldy.
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 Boost Windows 7 SP1 USB Storage Devices Performance by Increasing Maxi




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