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Graduate
July 13, 2024
Question

Why is SCSI opcode 0xA1 (ATA_PASS_THROUGH) sent?

  • July 13, 2024
  • 1 reply
  • 996 views

I'm writing my own USB BOT device driver, and I'm receiving the SCSI opcode 0xA1, which isn't defined in SPC or SBC, but rather in the ATA Command Pass-Through specification. Even WireShark doesn't recognize it.

PhucXDoan_0-1720845444192.png

What exactly is the significance of this command? From what I'm getting, it's to bypass protocols or something, but I'm not exactly fluent in IT terminologies or 90s history here. I'm on Linux Mint 21.3, if that's of any relevance.

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    1 reply

    Graduate II
    July 14, 2024

    Reviewing the Linux source for USB MSC might be most enlightening. ie comments or commit histories