USB Flash booting and MBR vs GPT

I have had a few people contact me with issues regarding building All in One – System Rescue Toolkit flash drives over the last few years. Yesterday, I was messing around with a MacBook at work, and recently I found out the following:

  • FAT32, required for EFI booting, has a 32 GB limit when formatting flash drives using Windows.
  • If you re-use flash drives for multiple purposes, your flash drive may be left formatted with GPT partition scheme. You will need to use diskpart or similar utility to format to MBR for EFI booting of my toolkit.
  • The official toolkit USBs are built using new flash drives < 32 GB. Most manufacturer’s have been providing MBR partition scheme USB drives.

If you’ve had trouble building flash drives with older versions of my toolkit, this should help. I will look into workarounds in the upcoming versions.

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