Meaning of 'storage'

[Foka]

Test No. incompl/inter-50 "Computers", question 6

The great advantage of having an external zip drive is that you can use it as an extra means of ..........

(a) hoarding
(b) keeping
(c) holding
(d) storage

Test No. incompl/inter-50 "Computers", answer 6

The great advantage of having an external zip drive is that you can use it as an extra means of storage.

Correct answer: (d) storage
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I don't undersdand this question.

Foka

[Alan]

This means the ability to keep extra information on your computer.
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English as a Second Language
You can read my ESL story Phrasal Verbs/hold