I do have two of the 320gb SDD drives supporting my 4 2tb's (booting from one of them, the other is configured as a virtual swap file), just thought in using them in the car, but very true what you said, 64gb should be way more than what is needed.
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F30 320i Luxury individual on order
Currently driving E90 2010 323i Exclusive individual
Previously - E90 325i Exclusive individual, E46 320i Exclusive individual, Hyundai csi 1.5
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