iPhone 15 Pro not getting fast transfer speeds with USB 3.1 Gen 2 cable

Hi,


I just tested a new Amazon basics USB 3.1 Gen 2 cable compared to a basic USB-c apple cable.


I attached iPhone 15 Pro to m1 Macbook and on the Mac I opened the iPhone Finder window> files and located VOX APP (audio player).


Then I started a timer and copied 1.5 gigs of songs (from ssd) to the phone


time about 56 seconds


Then I unplugged and switched cables to the old Apple USB Cable and did the same test


Then I started a timer and copied 1.5 gigs of songs (from ssd) to the phone


time about 57 seconds


So they both seem to use the same speed transferring to the phone.


I would certainly expecting they much faster transfer speed with the new USB 3.1 Gen 2 Cable.


Q: I am curious what is happening here and why I didn't get faster speeds with the new cable?


Any suggestions are welcome – Dave


iPhone 15 Pro

Posted on Oct 10, 2023 8:51 AM

Reply
1 reply

Oct 10, 2023 9:07 AM in response to musenet

Transfer speed includes many factors, and the cable throughput is only one of them. You also have the search speed in the source, the transfer speed out of storage on the Mac, the overhead of adding a file and associated metadata to the SQLite database on the iPhone (which takes multiple reads and writes), and the write speed of the ssd on the iPhone. Note that write to an ssd is much slower than read. Your transfer speed of ~15 gbps sounds pretty reasonable.


What your test shows is that the USB transfer speed is not the limiting factor in this transfer.

iPhone 15 Pro not getting fast transfer speeds with USB 3.1 Gen 2 cable

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