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On 4/17/24 07:21, hlyg wrote: > my freebsd 13 is installed at flash disk of dell thin client > > it doesn't work well, i want to remove it > > "dd if=/dev/zero of=/dev/ada0 count=1000 ..." doesn't work, freebsd > doesn't allow If I recall, writing directly to a disk that is otherwise mounted is disabled by default; geom(4) describes setting kern.geom.debugflags=10 to alter that. > according to dell manual, i shall be able to enter bios by pressing F2 > before bsd booting so that i can set boot sequence to boot from usb > disk, but i can't enter bios, pressing F2 doesn't work The ability to press a key can be altered in some BIOS configurations. F12 is an alternative on many Dell computers to go to a menu which should offer going to BIOS once it comes up. Either key should be repeatedly tapped just after power on until you get the screen you want or the OS boot loader has been reached or passed; I do not recall seeing a Dell computer that required it be held, nor one that would not enter BIOS if tapping too soon. I commonly just tap F1, F2, F10, and delete to get into BIOS though there are machines with setups requiring F7, F8, F10, Esc, etc. to get in, get to a menu, or temporarily choose the boot device directly. "If" your keyboard has a modifier like fn key then you 'may' need to press it in combination with the BIOS key Some keyboards do not always start fast enough to enter BIOS; try connecting the keyboard direct to the computer instead of a USB hub and try different ports on the back as USB2 vs 3 can make a difference and which USB chipset it is on can too. > it's not easy for me to open case and dismount disk > >
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