A bootable flash drive only lives once. Why?

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wazebup2016-09-29 21:07:03

linux

wazebup, 2016-09-29 21:07:03

Good evening. I have noticed more than once - I make a bootable USB flash drive, from Linux and with Linux, I do it with the help of dd. I just copy the .iso image. The flash drive boots and works great. But only once. And the second time - does not want to boot, writes "DISK BOOT FAILURE". As if something after the first boot overwrites the bootloader on it. I don't understand what is happening. I make a USB flash drive in a similar way through dd a second time - and again it is enough for one download. Laptop with secure boot but disabled.

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2 answer(s)

O

Oleg Tsilyurik, 2016-09-29
@Olej

I do it with dd.

Don't do it with dd.
It may well be that after that it is necessary to restore it: restore the flash drive .

C

CityCat4, 2016-09-30
@CityCat4

dd is an extremely low-level thing. A backup taken by him is guaranteed to be restored only to the same device (or to a device with exactly the same parameters). Flash drives - even of the same capacity - always differ slightly in parameters. dd don't care - he restored everything. But the loader can "fix". If there is a gui, you can use unetbootin - it is also available under linux.