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Level 1

9 points

Slow USB card reader

I have a Rosewill USB RDCR-11002 card reader and when I try to transfer photos with both my Transcend 800x 32GB and Transcend 16GB 400x cards my Mac Mini gives one of two errors:

The Finder can’t complete the operation because some data in “IMG_9596.CR2” can’t be read or written. (Error code -36)

It says it's a specific Raw file in this example but I can transfer a random folder, for instance a folder of .jpg photos and get the same error. And sometimes the data will transfer but will give a card didn't eject properly error immediately after or during the transfer.

I went to Rosewills site for maybe a firmware update to the card reader and there doesn't appear to be anything available. I did send an email about the issue.

I've noticed that the transfer has become very slow and laggy lately also. I use to be to transfer data from the card very fast. The progress bar would zip across.

I have a 2012 Mac Mini with 10.10.4

Any ideas whats going on? I can order a different card reader but wanted to make sure there wasn't anything going on with the Mini.

Thanks

Posted on Jul 28, 2015 10:28 AM

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5 replies

Level 10

210,411 points

Jul 28, 2015 11:17 AM in response to idntknw

Try the card reader and cards on another computer.

Could be a bad reader or cards.

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Level 1

9 points

Jul 28, 2015 11:27 AM in response to lllaass

Thanks for the reply. The only other machine I have is a windows and it only supports 2.0 but I will try it and see anyway.

Thanks again

Edit: I tried it on the windows machine and it transferred about 300MB of data in about 15 seconds. So I guess that's about right for 2.0 correct?

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Level 10

210,411 points

Jul 28, 2015 12:47 PM in response to idntknw

Yes, that is right for USB2.

Does the Mac work OK with an external USB drive? That will help test the USB port.

You can also try resetting the SMC and NVRAM

Intel-based Macs: Resetting the System Management Controller (SMC)

About NVRAM and PRAM

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Level 1

9 points

Jul 28, 2015 2:09 PM in response to lllaass

I tried a 16gb 3.0 USB thumb drive and it transferred around 700MB in about 10 seconds.

I've tried the resets and it may help some the very first time I try to copy something over. But then it's back to the slow transfer and errors.

I try the resets again.

Thank you

edit: Done the resets and had the error code the first time I tried.

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Level 1

9 points

Jul 30, 2015 10:28 AM in response to idntknw

Just a follow up. It was the card reader. I purchased a different reader and everything is back to normal.

Thanks for the replies.

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Slow USB card reader

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