However, for the more serious problems of incorrect capacity or a completely unrecognized drive, the is the definitive solution for these Alcor-based drives. While it requires a bit of patience, it is a free and effective way to revive your USB flash drive.
It is a generic descriptor that the controller uses when its main firmware has been corrupted or erased. Most healthy flash drives from reputable brands (e.g., Verbatim, Kingston, Sandisk) will display their actual brand name and capacity here. When you see "AU87101A UFDISK" and a fake generic serial number like "123456789ABCDEF," it is a digital cry for help.
find /mnt/au87101a -type f -size 0 -delete # Delete empty files find /mnt/au87101a -type f -name "*.tmp" -delete
This indicates the physical NAND memory is dying. You can try selecting "Low Level Format" in AlcorMP settings to bypass the worst sectors, but the drive's capacity will decrease. "Hardware Not Found": au87101a ufdisk full
Given the alphanumeric format ( au + 5 digits + letter a ), this strongly resembles a (e.g., Anritsu, Yokogawa, Fujitsu, or LG Industrial Systems).
If you’ve landed on this page, you’ve likely seen this error flash across a terminal, a CNC machine console, a vintage Unix workstation, or a proprietary medical or telecom device. This message indicates that a specific logical or physical storage volume — managed by a utility called ufdisk — has reached its maximum capacity. The au87101a prefix is most likely a device, partition, or firmware identifier unique to a particular hardware family or software build.
Select if you want the utility to salvage every usable megabyte. However, for the more serious problems of incorrect
Prevention is always easier than recovery. Here are some best practices to keep your USB drives healthy.
Before jumping into complex firmware flashing tools, rule out standard operating system bottlenecks or port communication drops. 1. Test Hardware Isolation
Navigate to the tab. Change the configuration from High-Level Format to Full Scan (or Low-Level Format) . This commands the controller to forcefully test every individual sector. Set your Optimize Strategy preference: Most healthy flash drives from reputable brands (e
The primary causes of the UFDisK full condition on AU87101A are:
If the tool does not detect it, you may need to use Alcor Change PID/VID Rework to reset the identifiers to the default 058F/6387.
| Symptom | Observed Effect | |---------|----------------| | Logging failure | New log entries are discarded; syslog stops updating | | Configuration save error | “Write failed – no space left on device” when saving settings | | Capture aborted | In-progress data captures terminate prematurely | | UI/CLI warning | “UFDisK full – clear space immediately” message on console/web UI | | Reboot hang | Device may fail to boot fully (cannot write temporary boot files) |
: Completely cleans the memory matrices, mapping around physical damage.