Phison Mpall V5.03.0a-dl07 »

Introduction

• The drive shows 0 MB capacity in Disk Management.
• The drive is write-protected despite having no physical switch.
• Windows asks to format the drive every time you insert it, but formatting fails.
• The drive is detected but has an "Unknown" or "No Media" error.
• The drive has extremely slow performance (< 1 MB/s write speed) that isn't solved by normal formatting.
• You need to create a dual-partition USB (e.g., a bootable Windows installer + data partition).

alongside a standard storage partition (Mode 21), or a dual-volume setup (Mode 7). Super User Technical Assessment Compatibility : This specific version ( ) is typically used for controllers like the PS2251-07 (UP307) , which are common in USB 3.0/3.1 drives.