When I tried to make a bootable USB Flash Drive, containing Acronis Disk Image 10, for my Advent 4211 Netbook (no CD Drive) I found that it wouldn't work if the bootable partition was larger than about 128 Meg.
You may need to partition the drive to about 100 Meg, load the required software and "waste" the rest of the drives capacity. Alternatively you could try to obtain a 128 Megabyte USB Drive and use that to boot from. Your PC's BOIS settings may also have settings that affect booting from USB devices.
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