# USB04 compliant-sync HPT export Release qualification

Date: 2026-07-30

## Scope

Controller A exported a meaningful retained HPT range to `USB04_32G` while
running the final Release firmware. The drive is the compliant-cache control
specimen: it accepts SCSI SYNCHRONIZE CACHE and must not select the
compatibility fallback.

## Identity

- Controller assembly: `1751136`
- J-Link serial: `69664082`
- Release S-record SHA-256:
  `838645AF04F6718231AE892A7F2EB16EC6710A8354DA270A6601CFEAC8E6ABE9`
- SD protocol state: `6`
- SD CID valid: `1`
- Representative SD-sector read: `1`
- Raw SD CID: `035344535330384780976F0084018559`
- USB label: `USB04_32G`
- USB hardware serial: `071C49DE246A1F97`

## Controller result

- Requested HPT range: `301739760..302168995`
- Actual HPT range: `301739760..302168940`
- Retained records: `6974`
- Records selected/published: `6973`
- Snapshot gaps: `0`
- Requested-range gaps: `0`
- Healthy/degraded records: `6973 / 0`
- HPT status / USB status / first USB failure: `0 / 0 / 0`
- Terminal state: published, complete, USB phase `14` (complete)
- HPT staging: `8.89 s`
- USB publication and fresh-session verification: `17.09 s`
- Total: `26.01 s`
- File-write calls/bytes/max request: `11 / 350621 / 32768`
- Close / media flush / rename: `0.01 / 0.24 / 0.02 s`
- Fresh verification: `350621 / 350621` bytes
- Post-export sync-cache compatibility required: `0`
- Post-export cumulative compatibility count: `4`, unchanged from baseline
- Media handoff acceptance mask: `15`
- Live system errors: `0`

The unchanged compatibility counter proves this HPT publication used the
successful SYNCHRONIZE CACHE path. The durability handoff still performed its
fresh-session VBUS/remount verification and returned a complete full-file
verification result.

## Independent Raspberry Pi verification

The Pi identified the exact specimen as `/dev/sdb`, partition `/dev/sdb1`,
label `USB04_32G`, serial `071C49DE246A1F97`.

- Unmounted `fsck.vfat -n -v` passed with no filesystem error:
  `15 files, 2642/1893477 clusters`.
- The volume was mounted read-only for inspection.
- Published file: `USB04_HPT.csv`
- Exact size: `350621` bytes
- SHA-256:
  `647E6AAA10C515F493CC84141E19E524F38272870447503D0B0234EB37A022B6`
- Completion trailer:
  `Export completion: COMPLETE; records published: 6973`
- The final data row is record `6973` at HPT timestamp `302168940`.
- No temporary export file was present.
- The volume was unmounted after inspection.

## Result

PASS. A real retained-range HPT export on `USB04_32G` completed through the
compliant SYNCHRONIZE CACHE path and survived the controller's fresh-session
durability barrier. Controller counts, terminal status, independent FAT
inspection, exact file size, CSV trailer, and hash are mutually consistent.
