Hi!
'The disc drive only stores X bytes.' Does it mean that
(1) there is only X bytes written on the disc drive at this moment,
(2) the disc capacity is X bytes,
(3) can mean both (1) and (2)?
The plain present 'stores' means it habitually does: this is its capacity. Same with 'holds'. In theory, we could use the progressive 'is storing' or 'is holding' for what it currently has on it, but we don't.