I've seen similar questions on here but I'm asking anyway because it's starting to annoy me...
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I have the newest Macbook Pro 13' Retina Display (2015). Processor: 2.7 GHz Intel Core i5, Memory: 8 GB 1867 MHz DDR3. It's running on OS X Yosemite 10.10.3
I bought a Seagate Backup Plus for Mac external hard drive and the computer was recognizing it just fine, all I had to do was plug it in and it lit up. The icon showed on the main screen, and it was automatically backing the computer up.
Spontaneously that has stopped. It is still plugged in and lit up but Finder does not recognize the hard drive. It isn't showing up on my screen. Time Machine says it isn't here.
I already attempted to try different USB ports since it is USB connected, in case those were damaged. But I don't think there is any damage to either end of the USB connection because it is lighting up when I plug it in.
Around the same time that the computer stopped recognizing the Seagate drive, it started moving slower. My internet crashes pretty frequently while other computers in the house are running fine on the modem, videos become choppy and the audio is sometimes off, and things take longer to load, or sometimes it just gets stuck loading. I don't know if this is part of the problem or not... I did opt for the smaller hard drive which is why I am using an external.
MacBook Pro with Retina display, OS X Yosemite (10.10.3)
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To see the size of a specific file or folder, click it once and then press Command-I. To see storage information about your Mac, click the Apple menu in the top-left of your screen. Choose About This Mac and click the Storage tab. For Time Machine backups, it's good to use a drive that has at least twice the storage capacity of your Mac.
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macOS can save space by storing your content in the cloud. This isn't a backup, but it includes new tools to make it easier to find and remove large or unwanted files before you make a backup.
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