Au87101a — Ufdisk Repack Fixed

Technical White Paper: Repacking Strategies for the Alcor Micro AU87101A Controller

Date: October 26, 2023 Subject: Firmware Restoration, Mass Production Tools, and Low-Level Formatting

UFDisk (UFD Utility): This is a consumer-grade tool used for managing USB drives, specifically those with SMI (Silicon Motion) or Alcor controllers. It is often used to "repack" or reconfigure a drive's internal structure to: Create bootable partitions. Set up password-protected "Security" areas. au87101a ufdisk repack

Reconstruct image container:

innoextract original_ufdisk.exe
7z a -sfx au87101a_ufdisk_repack.exe extracted/*

Part 3: Step-by-Step Guide to Using the Repack

Prerequisites

A Windows XP or Windows 7 32-bit machine (the repack uses 16-bit DLLs and direct I/O; Windows 10/11 64-bit blocks it unless you disable driver signing and run in a VM).
Administrator rights.
The AU87101A UFDISK repack archive (find it on archive.org, certain USB boot forums, or legacy driver repositories). File name often: au87101a_ufdisk_repack_v2.3.7z.
The target USB drive (do NOT use on any drive with important data; the repack will wipe everything).

: Adjustments to help the software run on modern operating systems like Windows 10 or 11. How to Use AU87101A Tools Safely If you are looking to repair a drive with this chip: Identify the Chip : Use a tool like ChipGenius to confirm your drive actually uses the Technical White Paper: Repacking Strategies for the Alcor

The AU87101A is a specialized controller by Alcor Micro commonly used in card readers and USB flash drives . The "uFDisk Repack" refers to a customized or bundled version of the uFDisk utility (a low-level formatting and partitioning tool) designed specifically to work with this Alcor chipset. Purpose of uFDisk for AU87101A Reconstruct image container: innoextract original_ufdisk

You likely need to first unpack the firmware using a tool like binwalk, unufdisk, or a vendor-specific extractor.
Then modify files (e.g., replace a logo or configuration).
Finally, repack it with the same tool or a script.

Verify the VID/PID: Note the Vendor ID and Product ID to ensure the software recognizes your hardware.