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Acronis TIH 2011 - 32GB USB stick wont boot. Can't write to USB

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My backup is about 14GB as i've just done a clean Win7 install, installed the programs i need & then done a backup.

I had a Kingston DataTraveler 101 16GB USB stick. I wanted the stick to be the bootable media AND hold the .tib backup. Due to this i had to split the backup into 4GB portions.

Seperately, it would fit on the USB stick, but it just would not go on when i tried to write to the USB stick & make it bootable.

I bought a 32GB version of the DataTraveler 101.

I then tried to just make both USB sticks bootable - with no backup file on there at all. The 16GB stick was bootable - straight into the acronis boot loader.
The 32GB on the other hand just would not boot. Windows boot loader wouldn't recognize it as a kingston stick (it DOES with the 16GB stick). It just would not boot.

Is there a reason why this wouldn't work? Does Acronis not like anything over 16GB to make bootable? Is it likely to be a faulty stick?

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I have several (many) different USB flash drives of various sizes. In one of my systems, one of my flash drives is not seen by the system as a bootable device, but works well under Windows. I have tried every trick in my book. All the others work fine, and this flash drive WILL boot in other systems.

Different USB flash drives use different internal controllers, and different system boards activate the flash drives differently at boot time.

First, try moving the 32GB flash drive to one or more different USB ports on your system. Try booting from each one. If this still fails, the 32GB flash drive may not be compatible (as a boot device) with your system.

Second, try booting to the 32GB flash drive in a different system to see if you get similar results.