Many times when there is a consistent flashing pattern on hard drive LEDs, it means the drive is in a failure state, especially when they won't mount. Most of the time there is either a clicking, or a very faint buzz/beeping sound. What is the mac operating system number for sierra. Sometimes, you can remove the hard drive and install it in another enclosure, as it is just the board inside the enclosure that has failed. But, most of the time, it is the drive mechanism itself. It would be hard to diagnose further without being able to handle it in person.
Jun 21, 2017 - When you use Time Machine, the inbuilt backup software for Mac, to back up all of your Mac data, if it is stuck in “Preparing backup” stage, you. Starting macOS Time Machine Backups to My Passport and External USB Drives. The device must be formatted as HFS+ in order to be used with Time Machine. WD Network drives such as My Cloud can also be used with Time Machine. Use Time Machine to back up or restore your Mac and Apple article HT204350: How to move your content to a new Mac.
Are you able to see the drive in Disk Utility? Do the iMac's USB ports work with other devices? It is possible that there may be an issue with physical damage on either your usb port on the Mac, on the drive itself, or with the cable. You should replace the cable & try another port. If the connection issue continues, then there may be physical damage with the port. If you think your drive is corrupted, and you have a backup of your data, then you can reformat the drive to wipe out the corruption and reuse the drive.
If you do not have a backup of your data, then you will need to do data recovery. I'm a real novice but I have a similar issue with my WD Passport 1TB external drive. It all started when I upgraded my OS to OS X Yosemite 10.10.5. The WD drive stopped backing up and became invisible to the Finder. I tried updating the WD firmware but that didn't help so I called support at WD and they told me the software is not compatible with the OS X Yosemite OS. They offer no further support or possible solutions other than buy a new backup. Don't think I want to buy from them since they don't support their device beyond 8 years.
I know that is a couple of lifetimes in computers, but it doesn't seem long enough for a backup drive. Any help I can get for retrieving my data would be helpful, there's only one port on the back. What is a good system to replace this useless piece of junk with? Sorry about your issues, jector1729.
And what a lousy attitude the 'support staff' at WD have! I will try and answer your questions as best as I can. First, the easy one: the best brands of hard drives (either traditional HDDs or SSDs) that 'play nicely with Macs' are Seagate for HDDs, and Samsung for SSDs. When I was using traditional HDDs, I always stuck with ones from Seagate, and now that I use only SSDs, I have all Samsung ones.
They have always worked well with any Mac I have owned. Of course, it is best to take care of such drives (even internal ones) from a software perspective by doing routine/preventative maintenance (just like one does with an automobile).
Myself, I am a 'stickler' for doing disk cleanup/maintenance/repairs from a software perspective. You can do a lot of disk cleanup on your own, and there are some excellent programs available (both free and commercial) that can also help with those tasks. As for trying to 'rescue' the stuff off the drive, I assume the one (and only) port on the device is USB.
I am not an 'expert' in this area, but here are the results of a google search for 'Data Rescue software for Macs': One of those links is for a product called (appropriately) Data Rescue 5: I have no direct experience with it, but a number of folks here have recommended it previously, and you can use it in demo mode. In actuality, assuming it works, it could be a real good investment to purchase it. Good luck, and if you can, let us know how it goes. Thanks very much for all the information and the quick response, Honestone. Now I will tell you a very strange story: I've been out for the evening and I just returned home. I go to my Mac and it seems to be running very slow, so I do what I always do when it runs slow - I reboot it.