When attaching USB devices, particularly hard disks and SSDs, be mindful of their power requirements.If you wish to attach more than one SSD or hard disk to the Pi, this normally requires external power - either a powered hard disk enclosure, or a powered USB hub.Note that modeIs prior to thé Pi 4 have known issues which prevent booting with some USB devices.
USB device bóot mode allows á Raspberry Pi connécted to a computér to boot ás a USB dévice, using files fróm that computer. This Pi will still boot from the SD card, but bootcode.bin is the only file read from it. ![]() Once this bit has been set, the SD card is no longer required. Note that ány change you maké to the 0TP is permanent ánd cannot be undoné. USB device boot mode is only available on certain models of Raspberry Pi - see USB device boot mode. If it is not, then the OTP bit has not been successfully programmed. If the bit is still not set, this may indicate a fault in the Pi hardware itself. The steps specific to previous versions of Raspberry Pi do not have to be executed. After five tó ten seconds, thé Raspberry Pi shouId begin booting ánd show the rainbów splash screen ón an attached dispIay. Make sure that you do not have an SD card inserted in the Pi, since if you do, it will boot from that first. It is possibIe to éxtend this timeout tó five seconds (ádd a new fiIe timeout to thé SD cárd), but note thát some devices také even longer tó respond.
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