You may claim hard drives as Office Expense. It is not substantial enough to be assigned a CCA class, therefore it can be applied as office supplies. To do this on TurboTax Online:
> Sign in and choose your tax return for the year,
> On the left navigation pane, choose Income, Self-Employment, then Business or Professional Activities
> You will click Edit on the right of the business in question
> Choose business expenses; you will be provided with a guide of what expenses you are to report. You may report them or simply click Continue until you reach Office Expenses
> And from here you may report your 2 hard drives as a business expense.
Make sure to hit Continue so that your information is saved.
For more information, check out: Canada Revenue Agency (CRA) - Business Expenses
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