[Santosh Natal]

How can I access android phone's storage as mass storage directly in Win7 instead of seeing as connected phone (like when we see as pen drive connected)?
I want to see phone connected as pen drive and not as "Phone" in windows explorer.

[chanchan05]

You don't.

You can't do that since the OS lives on that drive. Connecting it as mass storage would disconnect the OS on the phone and render it off, so the drive can't be accessed if you do that.

[B. Diddy]

Welcome to Android Central! I agree with chanchan05. With much older phones, you could mount as USB Mass Storage, because they used to partition Internal Storage into a system partition, a user-accessible app-installation and storage area, and another partition that acted like an "internal SD." When you mounted the phone as USB Mass Storage, it was this 3rd partition that would get mounted -- but while mounted, the phone had no access to it.