Any Problem Using Two External USB-Powered HDDs on rMBP?

Started Mar 29, 2013 | Discussions thread
BeachnCruz Senior Member • Posts: 2,034
Re: Good luck ... I prefer to opt for AC Power Adapters

RustierOne wrote:

On my rMBP (2.3 GHz, 250 GB SSD, 16 GB memory) I've have been using an OWC Mercury On-the-Go-Pro enclosure with Seagate Momentus 750 GB 7200 rpm USB 3.0 HDD for Time Machine backups. It's partitioned 100 GB general storage and 650 GB TM backup. Since I also have a Toshiba 750 GB 5400? rpm USB 2.0 HDD, I've began using it partitioned the same for alternate TM backups. Both are bus powered and are seeming to work just fine, despite OWC's warning against bus powering more than one HDD at a time.

Question: Is there any problem running these HDDs at the same time, both bus-powered?

I really like having both powered up on the 2 USB ports, alternating TM backups every hour. But being somewhat cautious, I'm wondering if I could be damaging anything with this setup. So far the only problem is remembering to eject all 4 partitions before shutdown.

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Best Regards,

OWC advice is generally good. AC Adapters are an inexpensive way to improve your odds for avoiding a possible future HD/Time Machine/backup issue. I only occasionally depend on ext HD bus power if on the road and away from a reliable AC power source.

OWC AC Power Adapter


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