usb3 drive disconnecting all the time at a usb 3 port on my macbook pro

I have the same problem! Relatively new 27" iMac (late 2013). Unfortunately both of my external USB drives are USB 3.0 so they do not stay mounted at all. Sometimes it's ok but most of the time my USB 3.0 drive is unmounted within minutes of getting it re-mounted - so it is useless.

I can connect another external monitor - which is older and only has USB 2.0 ports and the drive stays mounted with no trouble, but sometimes I need to use the monitor for my work machine.

I wish Apple would fix this problem. It's pretty bad. 😟

I'm also experiencing the same problem. I got a MacBook Pro two months ago and just tried connecting a USB 3 to SATA drive enclosure. There's no software. It's supposed to be plug and play. The problem is obviously with the mac's software because I'm not disconnecting it and there's nothing running but the OS. 30 seconds to a minute and the drive disappears from my desktop and a message appears;

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Disk Not Ejected Properly

Eject "name of drive" before disconnecting or turning it off.

[Close] button

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Does anyone besides frustrated users look at these discussion boards?

Is Apply paying attention?

Please Help!!!

Did you already format the new drive? I suggest to do that, even it says that it is formatted already for Mac.

OSX Extended (journaled).

My drive is from my previous macbookpro. The logic board broke and I need to get my data out. It had the latest OS. I kept it up to date. Short answer, it is formatted properly.

Does Apple ever respond to these posts?

Hi everyone i have been sufering this problem with usb 3.0 with windows and now mac, i just "resolved" the issue using and usb 2.0 hub as bridge. Im buying a thunderbolt hub, the belkin one, in the next days and im going to try using as the bridge maybe that way the issue can be solved and we can maintain the fast troughtpout ok newer conection types. This is very bad for apple, im an apple fan boy a they most come up with a solution for this. I haven tried the card reader and hdmi out of my MBPr 13 late 2013 yet but im hoping for they to work fine. Has anyone had issue with those ports?

Apple is not here. Some Apple people are reading posts here and they may respond, but the company itself is not. This is strictly a users-to-user forum.

Do not connect to USB with a hub, make sure that the disk gets enough power from the USB port, there should be an external power cable with the external housing, if there is a "double headed" cable with the external housing, be sure to connect the disk connector and the 'power' connector both to both usb ports.

I haven tried the card reader and hdmi out of my MBPr 13 late 2013 yet but im hoping for they to work fine. Has anyone had issue with those ports?

I have not.