Click on the name of the external drive in the left panel of the Disk Utility. Open the Disk Utility tool on your Mac. Either head to Applications > Utilities, or tap Command + Space and start typing Disk Utility. Thus far I haven’t found what the problem is.Here's how to format a drive if you are planning to use it with a Mac. I have posted this issue on the Apple forums.I then decided to use some of the space for external file storage and copied several GB of files to it from another drive. I recently updated my Mid-2012 MacBook Pro directly to Catalina 10.15.5, skipping any earlier versions of Catalina.I have a 4TB WD My Passport for Mac that I connect via USB primarily for Time Machine.I first used the drive only for Time Machine and it worked fine for a couple days. Disk Utility is where you repair, format, partition, copy. Combining Time Machine with the Migration Assistant (as explained in Chapter 11). Next, select either the APFS (Apple File System) format or the Mac OS Extended File System format, set the partition scheme to GUID, and click Erase to format.
![]() Nothing I tried to get it working helped.I removed the disc, connected it to a Windows computer and reformatted it. I could not even reformat it using Disk Utility. I could not unmount the disk or eject it. Then the next morning I had this notification:“The backup disk is not in Mac OS Extended (Journaled) format, which is required.”I couldn’t think of any way that could happen, but believed its story. I started Time Machine on one partition and copied other files into the second partition. So this time I erased the drive, partitioned it into two 2TB partitions, then formatted them both as Mac OS Extended format (Journaled) GUID. I found somewhere online that Time Machine may not work properly if there were any other files stored on the same drive with the Time Machine folder. Format Drive Time Hine Disk Utility Password Protected SecurityAt least there is none that I’m aware of. What could possibly make Time Machine think it is not?Why would Time Machine work perfectly all day, taking several snapshots of my computer, then fail every morning? The last successful backup is in late afternoon or evening, then every morning it fails with that false belief that the disk is not formatted correctly.I do not have any password protected security on the My Passport drive that might keep the drive from working when the computer is asleep. I found via the terminal that it is indeed set up as GUID.Why is this happening every morning? This disk has always been formatted correctly. I installed the new WD Drive Utility after I upgraded to Catalina because WD Unlocker software does no work with Catalina. I turned off its Sleep Timer in the WD utility in hopes that keeping the WD drive awake would keep Time Machine working through the night. I will also disable “Enable Power Nap” and see what happens.I thought maybe the new WD Drive Utility Software I installed had something to do with the problem. I will change my Energy Saver settings by unchecking the box “Put hard drive to sleep when possible”. The computer stays on 24/7.I welcome any input that might help me get to the bottom of this.Thanks for the information. Play multiplayer on n64 emulator for macBut I also updated the 5400rpm hard drive to a 1TB SSD. I have installed a new battery, again an update that has nothing to do with the Passport problem. I have upgraded the ram to 16gb, which was done several years ago and would have nothing to do with the recent problem. The problem that I was having with Time Machine throwing disk format errors every day seems to have stopped when I changed the settings so that the disks are not turned off at night.My MacBook Pro is a mid-2012 non-retina. The WD Drive Utility also automatically detected the other WD drive I use for Time Machine, so that’s why I turned off the sleep timer.I read somewhere (do not remember where) that the WD Drive Utility can cause issues with Time Machine, but I cannot find the article at this time.Another morning has come with no problems with the WD MYPassport for Mac. I don’t know if what I just described in this paragraph is actually happening. But if it does and the Passport is going to sleep, then not being awakened and powered up quickly enough by USB when Time Machine comes along, that could be contributing to the issue. I’ve not found any definitive info on that.
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