If 'No' is selected, the SD card will not be altered, but booting the USB device may be limited and/or unreliable as described above. If usb-boot is running on a Raspberry Pi 3B+ or a Raspberry Pi 3B with its OTP bit set, usb-boot first prompts: 'Use SD card to boot the USB device (recommended)?' If 'No' is selected, the SD card will not be altered and the direct USB boot capability of the Raspberry Pi 4 will be used. If usb-boot is running on a Raspberry Pi 4, usb-boot first prompts: 'Use SD card to boot the USB device?' In an effort to simplify the task, I've created the attached script named 'usb-boot' to automate the process. While setting up such a configuration is not rocket science, it can be confusing to a newcomer or someone unfamiliar with Linux internals. The easiest and most reliable way to run Raspbian on a USB device with any Raspberry Pi is to leave an SD card containing Raspbian in place, but use it only for starting Raspbian that is residing on a USB device. Unfortunately, both of these approaches have serious limitations and once working, can easily be broken by simply plugging in an additional USB storage device. A bootcode.bin file is available for older Raspberry Pi models. This native USB boot mode has serious compatibility issues. usb-boot also allows Raspberry Pi 4 users to migrate their SD card based systems to a USB device.Ī recurring topic of discussion is how to configure and reliably run Raspbian on a USB flash drive, USB hard drive, or USB SSD instead of an SD card.Ī Raspberry Pi 3B+ has a native USB boot mode (this mode has to be manually enabled by setting an OTP bit on a Raspberry Pi 3B). NOTE: usb-boot as been updated to allow the use of direct USB booting on the Raspberry Pi 4 (in addition to hybrid SD/USB booting on all Raspberry Pi models).
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