USB Mass Storage on Android Devices
From Free Knowledge Base- The DUCK Project: information for everyone
Another working title for this page could be, "I just want to connect my phone to my PC and have it show up as a drive letter so I can easily transfer files."
USB mass storage is the standard protocol used by flash drives, external hard drives, SD cards, and other USB storage devices. It also was used by Android devices and even many basic phones. At some point the brains that develop Android decided to do away with this useful feature. They have legitimate arguments against the feature. Yet, the feature is very much missed by those who used it.
The new options, Media device (MTP) or Camera (PTP) mode, are either unavailable to Windows XP and other OS users, or too limited.