USB memory stick question

[Phil]

Thank you for reading this.

I have an old Toshiba A100 laptop that will boot from and old Panram 256 
MB USB stick, no problem so far.

I bought a Verbatim 8 GB USB stick today and the A100 laptop will not 
boot from it. Same .iso file copied to both sticks with Unetbootin and 
both formatted to FAT 32 with GParted.

The Verbatim USB stick is readable in the A100 laptop but it will not 
boot from it.

Can anyone suggest why the newer USB stick will not allow the A100 to 
boot? Better still, how can I solve the problem? Surely the size of the 
USB stick is not the problem?

I need to fix a Grub problem with boot-repair and the A100 does not have 
a working CD drive. The older USB stick contains the boot loader so I 
can't copy boot-repair to it.

-- 
Regards,
Phil