explorer.exe using most of my RAM

I have a USB 2.0 external drive plugged into a USB 3.0 port and am running a disk check. My explorer.exe RAM usage is ~75% of the total RAM, and my RAM is nearly maxed out because of it. Edit:This behavior is normal, I've found. It does the same on another system of mine. However, the system in my system specs keeps hanging when I move the mouse, and programs are slow to respond. I am running Norton Internet Security 2012 and was wondering if this might be the cause?

Obviously, I could remove Norton and see if the problem exists again during a disk check, but I would prefer not to go this route just yet. Figured someone might know if this is a known issue...

The hard disk check came back clean; Windows checked the file system and found no problems. That rules out any hard disk corruption causing the problem.

The problem has returned in the same way it did last night. I was transferring files from a Macrium virtual disk created from one of my system images that exists on the external drive. The odd thing is, this time the RAM usage is high, but the culprit using all the RAM is not seen... I will post resource monitor images:

CPU:



Memory:



Processes with Disk Activity:



Disk Activity:




Edit: I tried plugging the USB 2.0 drive into a USB 2.0 port (I did not think this would make a difference), and it made no difference. Same problem remains. Next step is to uninstall Norton and see if the problem persists. Then I will try a clean install and see if the Sony software is interfering. If anyone has other recommendations based on the resource monitor images, please let me know.

Edit2: Tried all of the above. Nothing helped. I have decided to upgrade the RAM to 8 GB from 4 GB and see if that helps. I will post back when the new RAM arrives from Crucial.

Note that commit is just the amount of memory reserved by an application or Windows - it doesn't mean it's actually been committed and used. In this case, with how odd this appears, it might be worth getting the output of RAMMap from sysinternals to get a raw view (screenies are nice, and file > save then uploading the output file would be cool as well).

Well you may be able to turn off Norton's real time disk checking if it can be. But...

The Disk Check is a MASSIVE amount of disk IO which will slow down everything in the system till it's over. Especially if it's an external drive. And the high ram usage isn't surprising, on Linux fsck has been known to fill all available ram then crash the system if the drive is too big. As slow as it is, it's only as fast as it is because it uses a huge amount of ram to cache the drive contents for checking.

Just leave the system alone and let it finish (or run it overnight). Really, you shouldn't even be using the drive it's checking while it's checking it anyway, that may slow it down even more.

Normally it's not something you need to do very often if ever. So unlike backup or something that is meant to be run every day or every week, CheckDisk was not made to be "nice" and work in the background. It's more of a "Stop everything and emergency check the sanity of this disk" kind of thing.

If you zip your file you should be able to upload it OK. A .zip can be up to 8MB.