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#20
@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.
@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.
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.
Is it necessary to manipulate the registry???
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.
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. :)
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.
Yup, because looking back at the KB article:
VVVVPPPP are italicized, which obviously means those are variables, not to mention the note below it that says they represent hexadecimal values.
- Locate and then click the following registry subkey:
HKLM\SYSTEM\CurrentControlSet\Control\usbstor\VVVVPPPP