serv_benchmark/fichier_usb/id_0781_55_ab copy.md

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)