26 июл. 2020 г. · Simply put the USB into the MBP, and reboot while holding the Opt key. See if it shows up in the Boot menu. If it shows up, the USB is fine.

12 мар. 2022 г. · The iMac doesn't recognize the USB drive when I plug it in and start it while holding down the option key - it only sees the iMac's internal hard drive.

12 дек. 2016 г. · You've likely created a bootable Windows drive, so that's what Startup Manager says, even if there's no actual Windows present.

11 февр. 2017 г. · In order to boot from an external disk it must have a GUID Partition Map. If your USB disk is not formatted with that you will need to reformat ...

10 мар. 2020 г. · I made an install USB with TransMac and attempted to boot from that, but there are no drives listed, including the internal SSD. I have tried to reset NVRAM ...

28 дек. 2017 г. · You Mac will not boot from the flash drive because the drive is not FAT formatted using a MBR partitioning scheme.

23 дек. 2020 г. · Startup manager is not recognising the bootable USB that has been loaded with the Ubuntu Server Netboot ISO, though it is recognising a USB that ...

20 авг. 2017 г. · I found that it would no longer show bootable USBs at startup in the boot menu even though it definitely recognised them as seen in Finder.

16 нояб. 2017 г. · I downloaded a High Sierra DMG and created a bootable USB using both Transmac and PowerISO (in Windows 10) and none of them boots the system.

22 дек. 2020 г. · I booted a Mac Mini from a USB drive to install Ubuntu. Now I want to change it to Debian. I replaced Ubuntu on the USB drive. When I hear the boot chime and ...