Galaxy Nexus uses MTP instead of Mass Storage mode, so you can't mount it as usual.
However, there's an "ADB sideload" option that lets you sideload a ROM from your PC using the ADB command (if you have the drivers installed, in the command prompt window, just type "adb sideload *THE-PATH-TO-YOUR-ROM-FILE*").
Find out more with Google

Originally Posted by throwback1718 View Post
$10 paypal to who can help me solve this
We Chinese don't use Paypal

Sent from Google Nexus 4 @ CM11

Current devices:
Google Nexus 4 (CM11 Nightly)
Motorola Droid RAZR M (CM11 Nightly for JB BL)
Sony Xperia SP (CM11 Nightly)
Google Nexus 7 (2013, WiFi) (CM11 Nightly)
Samsung Galaxy Gear (Null_ Build 23)
Samsung Galaxy S WiFi 4.0 (CM10.2 Unofficial)
Nokia N86 8MP (RM-484 30.009 Pre-Hacked)

Multi-core smartphones are like M&Ms:
They don't melt on the store shelf... Just in your hands.