: The drive appears read-only, and formatting through standard Windows tools fails.
Right-click the Start menu and select Device Manager .
In plain English: Your PC sees something plugged into the USB port, but the SM3255AA controller is so confused that it cannot tell Windows what it is.
If your computer suddenly refuses to recognize your USB drive, or if it shows up as a generic "SM3255AA MEMORY BAR" with a Vid_090c&Pid_3000 signature, you have likely encountered a corrupted Silicon Motion (SMI) controller. The "SM3255AA Memory Bar Driver 43" isn't a single software file, but rather a catch-all term for the specialized required to re-flash and repair these specific USB flash drives. Sm3255aa Memory Bar Driver 43
Right-click your , select Uninstall device , and restart your PC to clear out systemic port glitches. Step 2: Extract Your Hardware Information
Close MPTool, unplug the memory bar, and plug it back in.
The controller identifies itself via the hardware ID string USB\VID_090C&PID_3000 . : The drive appears read-only, and formatting through
Download a specialized low-level hardware inspection tool such as or CheckUDisk .
: Before downloading any drivers, use the ChipGenius utility to verify your Controller Part-Number and Flash ID code.
When a flash drive triggers ("Windows has stopped this device because it has reported problems"), the problem is almost never the Windows driver software itself. Instead, it signals a deeper structural breakdown between the host controller and the NAND flash chip. If your computer suddenly refuses to recognize your
A: Almost certainly not. The repair process (re-flashing firmware) wipes the drive completely. If the data is valuable, do not attempt any DIY repair.
Typically features a single-channel flash interface and an integrated 80C51-compatible 8-bit microprocessor.
In Device Manager, find the device marked with an exclamation point (often "Unknown USB Device"), right-click it, and select Uninstall device
A: The USB controller chip is still alive and responding to basic USB commands. That is why the PC detects "something" but cannot read the storage.
Fix graphics device problems with error code 43 - Microsoft Support