49 lines
2.1 KiB
Markdown
49 lines
2.1 KiB
Markdown
# clar200-unlock
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Unlock two EMC/CLARiiON-locked Seagate **Exos X18** SAS drives
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(ST16000NM004J, fw ES2264 — SN **ZRS015V7**, **ZR511KWK**) via the Seagate
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**F3 service terminal**, using an **ESP32-C3** as a 3.3 V USB-serial bridge.
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Goal: turn two 16 TB paperweights into healthy 512-byte-sector disks for the
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`tank` ZFS pool, which is short on 14.6 TB+ spares (mirror-35 has a dead + a
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dying leg; ex-mirror-38 is a bare single-disk vdev).
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## Why this exists
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These drives answer SCSI INQUIRY/VPD but return `Hardware Error / Internal
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target failure` to **every** other command — including READ CAPACITY — so no
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host-side tool (sg_format, openSeaChest, SeaChest, firmware download) can format
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them. Full prior evidence: `~/bin/EMC_CLAR200_DRIVE_FIX_NOTES.md`. The F3 UART
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bypasses the SCSI layer; it's the only remaining DIY lever.
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## Layout
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| Path | What |
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| `PROCEDURE.md` | **Start here** — the physical + operational runbook (bench, wiring, flash, F3 entry, format, verify) |
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| `firmware/clar200_bridge.ino` | ESP32-C3 transparent USB↔UART bridge sketch (live baud menu) |
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| `firmware/flash.sh` | One-command build + flash from steel141 (`/dev/ttyACM0`) |
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| `docs/f3-command-reference.md` | F3 dialect — confirmed vs. 7200.11-era-only; what to verify with `?` |
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| `IDEA.md` / `DECISIONS.md` / `CLAUDE.md` | project brief / decisions / Claude Code context |
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## Hardware (current)
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- **ESP32-C3** on steel141 `/dev/ttyACM0` (native USB-Serial-JTAG, 3.3 V, MAC
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`58:8c:81:ac:f0:4c`). 3.3 V is a native match for the F3 header — no separate
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USB-TTL adapter needed.
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- **Target drive** ZRS015V7 currently in a pve173 JBOD → must be **benched** for
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F3 work (never in-chassis next to live tank).
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## Quickstart
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```bash
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cd firmware && ./flash.sh /dev/ttyACM0 # build + flash the bridge
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screen /dev/ttyACM0 115200 # open it; ~1/~2/~3/~4 set DRIVE baud
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```
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Then follow `PROCEDURE.md` from Step 2 (bench the drive).
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## Status
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Bootstrapped 2026-06-14. Firmware + procedure written; **not yet flashed, drive
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not yet benched.** See the latest `.claude/handoffs/` entry.
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