when the box pops up after you click mount, select the open folder option.

 

There is another possible problem, that's Window's related (go figure). Before you plug in the phone to the computer do a 'safely disconnect USB devices' in Windows. Check to see if there is already and F drive showing. Windows will often 'remember' that you had something different plugged in as F, and it gets confused when a different device shows up as F. I've had this happen fairly often on my computer (I use several different USB drives).
This may or may not be your problem, but it's worth checking.

 

ok I mount my Eris and it says that it is connected and syncing, but when I go to "my computer" it does not list the phone or the "sd card".....and suggestions ?

 

one question is your pc usb 1.5 or 2.0 androids have big issues with 1.5. other than that windows is always the problem with droids not connecting.

 

usb is 2.0 and running Windows 7

 

im having a problem maybe someone can help me. reading the above replies no one has my same issue. i just bought a new class 6 16 gig sd card to exchange it out for the standard 8 gig class 2. so i copied all of my files from the 8 to my computer. then i put the new card in and immediately it says damaged sd card you should reformat. ((thinking thats because its new and there is nothing on it for the phone to read)) then i formatted and same thing. so i plug my phone in to mount it so i can copy and paste the stuff on and what do you know the option for mount just isnt there. i rooted the phone with 2.1 and have done this with another sd card as well for my friend and never have i encountered this problem. only gives me the option to charge or outlook sync. not mount. any ideas?

 

When I switched to a 16GB, mine did the same thing. I set it aside for a while, thinking it really was bad and needed to be exchanged. When the second 2.1 leak came out, the 16GB was the only card I could find.

What the heck, give it a shot, right? Worked, and is working, perfectly. No idea what, if anything I changed. I fix computers for a living, and have seen way too may times where storage devices sometimes just need a "time out"