Yep, that's something I loved about Book 2. When a jump drive got hit, it degraded by one letter . Later rules made an acceptable compromise by degrading the drive by one level, but Book 2's implicit damage levels in the drive ratings is superior.
Just think. If English used a syllabary, maybe we'd not have this problem. With (say) 100 syllabic characters, we might have plenty of drive letters to go around...
ref: "OK, cross-reference your jump drive with your 50,000 ton hull."
owner: "Hmmm... here's 50k... and here's jump-3... that's an 'Argh' drive. Lessee how big they are..."