What you surmise, effectively happens. I can see the same behavior when I directly pluging and then unpluging the HD using the SATA power connector (I think that this happens for those hard disks or usb sticks whose chip is designed to detect a such action).
However, my interest is: how to detect the bit that increment the counter in the SMART register using usbdump(8) or wireshark. Is there a document that explain in details the usbdump output ? Regarding Wireshark what output string I need to look for (SMART ? .... POWER ?) I kindly contact you to know if someone of the list has already done this test, if he can address me on the right street among the numerous informations shown by wireshark or usbdump. Tutorials also are appreciated (if they exist). Regards. -----Messaggio originale----- Da: Bertrand Petit [mailto:elr...@phoe.frmug.org] Inviato: martedì 20 marzo 2018 00:01 A: Vincenzo Di Salvo Oggetto: Re: usb's quirks ... how to sniff bios'es messages addressed to usb rom chip On Mon, Mar 19, 2018 at 07:46:57PM +0100, Vincenzo Di Salvo wrote: > > 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. This description leads me to surmise that you are maybe observing the incrementation, by the HD itself, of a SMART register on power availability transitions as it is designed to do. I think you will observe the same behavior when directly pluging and then unpluging the SATA power connector. -- %!PS -- Bertrand Petit /D{def}def/E{exch}D/G{get}D/I{2 div}D/U{dup}D/L{roll}D/Y{setgray}D/N{newpath}D /O{N 0 0 moveto}D/P{pop}D/T{translate}D currentpagedevice/PageSize G U 0 G/w E D 1 G /h E D w I h I T 0 Y 1 setlinewidth 0 1 2 { P 120 rotate 2 4 w U mul h U mul add sqrt I 50 add {N 50 0 3 2 L 0 360 arc stroke}for}for/s{O true charpath pathbbox exch 4 -1 L E sub I 3 1 L sub I} D /l(bp)D 0.94 Y /Helvetica findfont 22 scalefont setfont l s P(x)s exch P T O l show showpage --- Questa email è stata esaminata alla ricerca di virus da AVG. http://www.avg.com _______________________________________________ freebsd-usb@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-usb To unsubscribe, send any mail to "freebsd-usb-unsubscr...@freebsd.org"
