Apple Thunderbolt 3 USB-C to Thunderbolt 2 adapter - backwards compatibility

Can anyone recommend a Thunderbolt 3 USB-C hard drive that I can connect to my 2015 MacBook Pro Retina 15" using this adapter? I've tried connecting a Lacie D2 Professional drive, but it wouldn't even power up.

MacBook Pro 15″, macOS 12.6

Posted on Feb 26, 2023 11:33 AM

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3 replies

Feb 26, 2023 12:38 PM in response to Philip Norden

The speeds involved with most hard drives do not warrant the money for any ThunderBolt cabling or adapters. The Apple thunderBolt-3 <-> ThunderBolt-2 adapter (US$50). The adapter does not supply POWER in either direction, so your drive must have a power source to use this adapter.


The drive you mentioned appears to be a Rotating Magnetic drive. These are surprisingly not limited by USB-2 cabling. At 480 M bits/sec, USB-2 cabling can carry just short of 50 M Bytes/sec, which is faster than almost every ordinary Rotating magnetic drive. any USB-3 cabling would be luxurious, and using thunderbolt connectivity would be extravagant (and never used near capacity).


For that enclosure and a MacBook Pro 2015, use a USB-3 Cable with blue insert, sold as a USB-3 cable SuperSpeed rated for 5 G bits/sec or 500 M Bytes/sec. If you need an adapter to USB-C be careful to get one that is rated for at least that, or a top spec one rated for 10 G bits/sec.



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Feb 26, 2023 4:23 PM in response to Philip Norden

The only equipment you mentioned is an existing LaCie drive. You may have forgotten to actually include the words, "...so that I can check out this setup for Video editing." I can't quit see all your equipment from here.


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Any drive that does not require POWER across the adapter can be used to check the data pathways in the cable/adapter.

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Apple Thunderbolt 3 USB-C to Thunderbolt 2 adapter - backwards compatibility

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