Related Clues:

• Phone add-on
• 'Big' prefix
• Prefix with bytes
• Both thin and thick stuff written by me — quite some name!
• The 'M' of MB
• Metric trillion
• Great match — second half on top
• ''Trillion'' prefix
• Commercial prefix with bus or upload
• Vitamin starter?
• It's larger than giga-
• Very — very large
• Lead-in to flops
• Gargantuan gastronome gaily guzzles
• Big, in ads