10.13.2 copy to usb slow

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Level 1

10 points

10.13.2 copy to usb slow

I just upgraded from Sierra to High Sierra on a MacBook Pro 15" 2017, 2.9 GHz Intel Core i7, 16 GB 2133 MHz LPDDR3 with 1 Tb SSD and 438 GB available. My transfers to external drives are very slow. I just purchased a SanDisk 128 GB Ultra Flair USB 3.0 Flash Drive which has a transfer rate of up to 150 MB/s. It is formatted as Mac OS Extended (Journaled) and I am using a USB-C to USB adapter purchased from Apple. Tried a different adapter with no better result. The transfers start OK but within a few seconds, it slows to a crawl. The estimated time for transfering a 69 GB Photos Library is 2 days. I started a 759 MB document transfer 50 minutes ago, while the estimated time was 2 minutes, it is still ongoing with 1 MB to go (it has been there for the past 10 minutes). I removed the virus applications I had on, thinking they were stalling the process, but that did not help. I hope someone has a solution to my problem.

Raymond

Posted on Jan 8, 2018 8:42 AM

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Answer 1

Dogcow-Moof

Level 8

36,839 points

Feb 6, 2018 11:48 PM in response to OldRay

At least on Amazon there have been several complaints of slow performance with that particular USB stick; are transfers also slow with other sticks or is that the only one you have on hand?

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Answer 2

Dogcow-Moof

Level 8

36,839 points

Feb 7, 2018 10:05 AM in response to OldRay

Have you updated to 10.3.3 as of yet?

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Answer 3

Dogcow-Moof

Level 8

36,839 points

Feb 7, 2018 10:13 AM in response to OldRay

I can't deny that but I also haven't seen the issue at all myself.

If you're near an Apple Store you may want to try copying a file to the USB stick there, as all store demo Macs are running 10.13 as well and that should give you a much better idea of whether the issue is universal or is for some reason unique to your Mac and/or configuration.

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Answer 4

OldRay Author

Level 1

10 points

Feb 7, 2018 5:50 AM in response to Dogcow-Moof

The transfers are almost impossible for large documents on all the USB sticks I own, even the ones that were performing adequately prior to the upgrade to High Sierra. The problem exists on both MacBook Pro 15" I upgraded.

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Answer 5

Feb 6, 2018 8:55 PM in response to OldRay

I have the same problem on a Mac Mini (Late 2014) transferring to a SanDisk Ultra Fit 3.0 USB 128GB. 4.5gb file transfer starts out taking less than a minute then actually takes over 10 minutes.

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