Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I'm using a 4GB SD Card in my Windows 7 laptop with Rreadyboost turned on for that particular card. In My computer the SD card shows its own drive letter. Since I'm only using the SD card for Readyboost and nothing else, I'd prefer for it not to be shown in My Computer. Can I remove the drive letter in Computer Management (so the SD Card won't show in My Computer), or will no drive letter disable the Readyboost feature?

share|improve this question
up vote 4 down vote accepted

Handy little tool called HideDrive does the trick. Tested and working on my own computer with Readyboost on a USB stick. You can still access the drive, even though it is hidden from Explorer which is exactly what I wanted to do too, just never got around to it. Word of warning, the tool restarts your computer when you hit apply.

If you are feeling adventurous, you could also edit the registry directly. Basically, navigate to Computer\HKEY__CURRENT__USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer and edit NoDrives to a decimal value using the chart below. Simply add up the numbers for the drive letters you want to hide. So to hide drive I:, set it to 256.

Drive Letter    DECIMAL Value
A   1
B   2
C   4
D   8
E   16
F   32
G   64
H   128
I   256
J   512
K   1024
L   2048
M   4096
N   8192
O   16384
P   32768
Q   65536
R   131072
S   262144
T   524288
U   1048576
V   2097152
W   4194304
X   8388608
Y   16777216
Z   33554432
share|improve this answer
i can confirm that. +1 – Molly7244 Sep 3 '09 at 23:13
+1 for the NoDrives reg hack. This is exactly what I wanted! – Peter Bernier Sep 16 '09 at 12:49
Works perfect, thanks! – James Sep 29 '09 at 16:41

Honestly, and I know this isn't an answer, but why not just invest in more RAM? SD is traditionally slow with writes, and readyboost writes to it a lot, so you may be going even slower than if you didn't have it at all and the OS paged normally.

share|improve this answer
I've noticed that playing DVDs with VLC runs slower under readyboost than not using readyboost at all. – Matthew Lock Sep 4 '09 at 0:24
Sometimes, it's not possible to invest in more RAM. My netbook's maxed out, for example. – Roger Lipscombe Nov 22 '09 at 18:26

In Windows 8.1 at least, ReadyBoost does not need a drive letter. You can remove the letter in Disk Management and it will still work, even after reboot (kernel is holding a lock on the file ReadyBoost.sfcache, the usual entries appear in the event log and the light flashes when opening programs, as expected)

share|improve this answer

Just to add to Kez's answer above, here's a link to the full instructions for Windows 7 which does not include this registry key by default (shows you how to create it properly with screen shots if you are having trouble finding it): Hide and Remove Logical Drives in Computer and Windows Explorer (NoDrives)

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.