To resolve this error and restore the drive, you must re-flash the controller using specialized "Mass Production" (MP) tools.
| Term | Likely Meaning | Technical Reality | |------|----------------|--------------------| | | This is a Silicon Motion controller chip (SM3255 series). It is commonly found in USB flash drives , cheap SD cards, and some SSD controllers. | Not a driver name. It’s a hardware chip ID. | | Memory Bar | Could refer to: - A RAM module (memory bar) - A USB flash drive (memory bar is a colloquial term in some regions) - A corrupted or mislabeled device in Device Manager | Incorrect term. Proper terms: RAM stick, USB drive, flash storage. | | Driver 43 | "Code 43" is a standard Windows error: "Windows has stopped this device because it has reported problems." | Generic driver failure code, not a driver name. |
Download and run , a portable diagnostic tool used to read low-level flash details. Select your USB drive from the top list.
Here are the technical details you should know about the tool: Sm3255aa Memory Bar Driver 43
If you continue to face problems after installing the driver, consider the following:
In cases where the drive is not recognized at all, professional technicians sometimes "short" specific pins on the NAND chip to force the controller into a manual test mode, allowing for data extraction. 3. Data Recovery Caution
Click to begin the low-level format and firmware rewrite. Warning on Data Loss To resolve this error and restore the drive,
The SM3255AA controller has been widely used in flash drives from various brands, including:
Expand the Universal Serial Bus controllers section. Look for a device labeled "SM3255AA" or "USB Mass Storage Device" with a warning sign.
If your drive is showing the "Memory Bar" error, follow these steps to attempt a recovery: | Not a driver name
If you still need help, post a screenshot of with the problematic device expanded — but black out any personal info. For genuine USB controller issues, refer to the USB Mass Storage Device driver built into Windows, which is all that is required for SM3255AA chips.
Right-click the Start menu and select Device Manager .
: The device is listed in Device Manager as "SM3255AA MEMORY BAR" instead of its commercial product name. Essential Tools for Repair
Note down the exact (e.g., Hynix, Micron, or Samsung memory strings). You will need this string to select the proper flashing profile. Phase 4: Firmware Flashing via SMI MPTool
: As a legacy USB 2.0 chip, it offers slow speeds compared to modern standards (typically under 20-30 MB/s read). hy-line-group.com ⚠️ What "Driver 43" (Error Code 43) Means