Formatter Silicon Power v3.7.0.0 is a specialized low-level formatting utility designed primarily for USB flash drives utilizing the Phison PS2251

You will need the Phison MPALL tool (v3.70 or newer) compatible with Go to product viewer dialog for this item. Backup Data: This process will delete all data permanently.

Disconnect the drive, clear your Windows temporary files, change ports, and run the alternative Phison Format & Restore Utility.

Right-click Formatter_SiliconPower.exe and select Run as administrator .

Look specifically for PS2251-03 (PS2303) , PS2251-67 , PS2251-70 , or generic PS2251-XX identifiers. Features of Formatter Silicon Power v3.7.0.0

Click . The tool will flash the firmware, format the drive, and re-map the controller. Do not unplug the drive during this process. 4. Finalize

If the drive shows 0MB space or is completely unreadable by standard Windows systems, you need Mass Production Tool (MPALL). This utility performs low-level sector mapping and burns fresh ISP firmware onto the PS2251 chip.

That is normal. The low-level formatter detected excessive bad blocks and downshifted capacity to maintain stability. You can force full capacity using PRETEST=3 , but that will likely lead to future data loss.