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.

One Reply to “USB Flash booting and MBR vs GPT”

  1. Hi Paul. I’m sorry but I don’t use any of the social media ways of contacting. I just wanted to tell you that with an ASUS Prime X570-P motherboard and Ryzen 5 4Ghz cpu your boot versions (all) just say basically unknown hardware and won’t boot to software menu.
    I used windows 7 Pro to create boot media. I do have windows 10 Pro bootable to create if this makes a difference.
    I love your software, am just sorry it’s not working for me right now.
    Kindest Regards.

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