| Feature | MTP (via wpdbusenum.sys ) | USB Mass Storage | |---------|----------------------------|------------------| | Driver involved | wpdbusenum.sys → WUDFRd → WpdMtpDr | USBSTOR.SYS → PARTMGR.SYS → DISK.SYS | | Drive letter | No (appears under “This PC” as a portable device) | Yes | | File system access | Mediated by MTP commands | Direct block-level access | | Safely remove required? | Not usually (transactions are atomic) | Yes | | Supports simultaneous PC + device access | Yes (device can modify while connected) | No (risk of corruption) |
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\PnP → Add DWORD "LogLevel" = 0xFF Reboot and check %SystemRoot%\INF\setupapi.dev.log . Set breakpoint: wpdbusenum fs driver windows 10
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