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fichier_usb/id_0781_55_ab.md

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+# USB Device Specification — ID 0781:55ab
+
+## Identification
+- **Vendor ID**: 0x0781 (SanDisk Corp.)
+- **Product ID**: 0x55ab
+- **Commercial name**: SanDisk 3.2 Gen1 USB Flash Drive
+- **Manufacturer string**: USB
+- **Product string**: SanDisk 3.2Gen1
+- **Serial number**: 040123d47e7a47e4ac9e89dd25318ac819d7be0fe18a9961190fdffe1052426fd4ae00000000000000000000a8e587bdff867418ab55810792a96c46
+
+## USB Characteristics
+- **USB version**: USB 3.2 Gen 1 (SuperSpeed)
+- **Negotiated speed**: 5 Gb/s
+- **bcdUSB**: 3.20
+- **Max packet size (EP0)**: 9 bytes
+- **Power mode**: Bus-powered
+- **Max power draw**: 896 mA
+
+## Device Class
+- **Interface class**: 08 — Mass Storage
+- **Subclass**: 06 — SCSI transparent command set
+- **Protocol**: 80 — Bulk-Only Transport (BOT)
+
+## Interfaces
+- **Number of interfaces**: 1
+
+### Interface 0 — Mass Storage
+- **Endpoints**: 2
+
+#### Endpoint IN
+- Address: EP 1 IN (0x81)
+- Transfer type: Bulk
+- Max packet size: 1024 bytes
+- Max burst: 1
+
+#### Endpoint OUT
+- Address: EP 2 OUT (0x02)
+- Transfer type: Bulk
+- Max packet size: 1024 bytes
+- Max burst: 15
+
+## Functional Role
+- USB flash storage device
+- Removable mass storage
+- No HID or radio functionality
+
+## Operating System Support
+- **Linux**: Native support via `usb-storage` / `uas` (fallback BOT)
+- **Windows**: Native mass storage driver
+- **macOS**: Native support
+
+## Performance Notes
+- USB 3.2 Gen1 capable of high throughput
+- Real-world speed depends on NAND type and controller
+- BOT protocol limits command queueing vs UASP
+
+## Power & Stability Considerations
+- High power draw for a USB key (~900 mA)
+- Prefer direct motherboard USB port
+- Avoid passive hubs
+
+## Recommended USB Port Placement
+- Rear motherboard USB 3.x port
+- Avoid USB 2.0 ports (bandwidth bottleneck)
+- Avoid shared hubs with RF devices
+
+## Typical Use Cases
+- OS installation media
+- Backup storage
+- Large file transfers
+- Bootable USB environments
+
+## Classification Summary
+**Category**: USB Mass Storage Device
+**Subcategory**: USB 3.x Flash Drive
+**Criticality**: Low (non real-time device)
+