# USB05_4G final Release qualification

Date: 2026-07-30  
Status: passed on Controller A, Controller B, and independent Pi inspection  
Release S-record SHA-256:
`678BCC0BAEE940D27417DC889C296732281B7AD40F04EC952DB620D7BC6F40FD`

## Controller result

`USB05_4G` mounted on both controllers with acceptance mask `15`, retained
mounted state, and reported zero system errors. WAV enumeration/load and sound
1 playback passed.

On both controllers, PID publication was followed immediately by a full image
save without an intervening VBUS recovery. The drive selected the
SYNCHRONIZE CACHE compatibility path. PID durability verified `225/225` bytes.
Image durability verified `8,388,864/8,388,864` bytes after 257 writes and one
physical VBUS/remount cycle.

The saved `7520553_SMI_00_05_00.imx` was then selected for update on each
controller. Both update/reboot roundtrips returned mounted with acceptance mask
`15`, the expected update file still enumerated, and zero system errors.

Controller A raw captures are under
`work/evidence/hpt-log-store-circular-mirror/controller-a/usb05-final-release-retest-20260730/`.
The final A image result was:

- progress `1000`, operation result `1`;
- 257 writes and `8,388,864` requested bytes;
- durability result `2`, `8,388,864` verified bytes;
- one power cycle, media generation `3`;
- compatibility required `1`, compatibility count `8`;
- mounted `1`, acceptance mask `15`, system errors `0`.

## Independent Pi inspection

The Pi identified the unmounted FAT32 partition as `/dev/sdd1`, label
`USB05_4G`, model `UDisk`, size 3.7 GiB.

Unmounted `fsck.vfat -n -v /dev/sdd1` passed without repair or reported
filesystem errors: two FATs, 980,857 data clusters, eight files, and
2,147 allocated clusters.

Read-only file inspection found:

| File | Bytes | SHA-256 |
|---|---:|---|
| `7520553_SMI_00_05_00.imx` | 8,388,864 | `8B12DDBBA784068889896C2970DD6932594377AC41837096C4767B26421ABBA2` |
| each of four `MainPid 2026-07-30 *.txt` files | 225 | `6BCB89F2EFACC503B950EF00151A51AF8353C40B53781110C14DDC441737FC3A` |
| `W00.wav` | 198,566 | `37A9DC665366F06D8081B23ECF88BDB30CF81546C3A10EDA1BE827DE2D006B92` |
| `W01.wav` | 176,516 | `E22FC8FFF2CF68878C56EA87660CA2325E0FBF04CF091AAEB112A7F274B1B2F7` |

No `.tmp`, `.part`, or `.bak` file was present. The filesystem was unmounted
again after inspection.

## Disposition

`USB05_4G` passes the final Release compatibility qualification. Its unsupported
SYNCHRONIZE CACHE behavior is successfully mitigated, including continuous
PID-to-image operation and post-publication fresh-session verification.
