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Date:      Mon, 19 Mar 2018 19:46:57 +0100
From:      "Vincenzo Di Salvo" <>
To:        <>
Subject:   usb's quirks ... how to sniff bios'es messages addressed to usb rom chip

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Hello guys,


reading the FreeBSD forums I learned about the usb freebsd mailing list.


I try to explain my question.


Plugging in an hard disk into the usb port (without mounting the
filesystem), I've noticed that the inserting operation was detected by the
chip and a counter inside the HD memory was increased by one each time the
hard disk was inserted. 

So a write operation has been happen !!!!!! 

The drive in question is a solid hard disk SSD 1TB Samsung 850 EVO Sata III=

This test has been done on a Linux O.S (that is a very disaster in terms of=

security policy, due to the demons of the GUI !)


This sounds like something done by the BIOS. Some can keep track on a wide
variety of things. For example, it happens that the Bios keep track of the
times when the case is opened.




Is the FreeBSD usbdump(8)  the right way to listen on events coming from
bios (in this case a writing access) and show changes happened into the rom=

memory of the chip of the usb HD ?


Appreciated is any your help also about the correct sintax of the usbdump.


Thanks in advance.



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