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If your MacBook Air is a USB 3.0 version, then you have 900mAH our of your USB 3.0 port which can power up most of the 2.5" HDD 5400rpm or 7200 rpm. I have Toshiba that needs 1A, Hitachi needs 700 mah, WD, 550 mah. Most likely, you can power up Hitachi and WD.

If your MacBook Air is USB 2.0 version, then you will need two cable since each port only provide 500 mah.

Walter Liu Waltercgi@gmail.com

If your MacBook Air is a USB 3.0 version, then you have 900mAH our of your USB 3.0 port which can power up most of the 2.5" HDD 5400rpm or 7200 rpm. I have Toshiba that needs 1A, Hitachi needs 700 mah, WD, 550 mah. Most likely, you can power up Hitachi and WD.

If your MacBook Air is USB 2.0 version, then you will need two cable since each port only provide 500 mah.

Walter Liu Waltercgi@gmail.com

If your MacBook Air is a USB 3.0 version, then you have 900mAH our of your USB 3.0 port which can power up most of the 2.5" HDD 5400rpm or 7200 rpm. I have Toshiba that needs 1A, Hitachi needs 700 mah, WD, 550 mah. Most likely, you can power up Hitachi and WD.

If your MacBook Air is USB 2.0 version, then you will need two cable since each port only provide 500 mah.

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If your MacBook Air is a USB 3.0 version, then you have 900mAH our of your USB 3.0 port which can power up most of the 2.5" HDD 5400rpm or 7200 rpm. I have Toshiba that needs 1A, Hitachi needs 700 mah, WD, 550 mah. Most likely, you can power up Hitachi and WD.

If your MacBook Air is USB 2.0 version, then you will need two cable since each port only provide 500 mah.

Walter Liu Waltercgi@gmail.com