I didn’t have any Windows computers at hand, but I did have a Chromebook in the house that I use for school. I tried the same steps for a third time on my MacBook Air (Intel, 2020) and every attempt to format the drive failed for the fourth time.Īt this point, I completely gave up on all of my Macs.
I did First Aid (which still said the drive was OK) and tried to reformat in every available format (except NTFS) again on my MacBook Pro 13” (Mid 2009) running MacOS Monterey (12.2). I then attempted to format in ExFAT, and then FAT32 again, which failed again.Īt this point I was completely exasperated, and settled on formatting it on another machine. I attempted to format in MacOS Extended (Journaled), which failed again. I then tried formatting in APFS, which failed once again. I tried First Aid, and it once again said the drive was OK. It now appeared, though still as an uninitialised drive. I followed the prompt to initialise it, and opened disk utility. Frustrated once again, I left the drive connected, and after about 10 minutes it appeared as an uninitialised drive. I used the terminal command “diskutil list” and it was not listed. Since the drive was visible in System Information, I figured the drive must be hidden somewhere. When I restarted the computer, the drive was not recognised in disk utility, but was visible in System Information. I then tried to eject the drive, and it would not eject.įrustrated with this, I disconnected the drive (without properly ejecting) and then installed the drive into a CD to SATA adapter internally. I then tried to format the drive as ExFAT and FAT32, which also failed. I ran First Aid again, which reported success. I then proceeded to attempt to format it as Mac OS Extended (Journaled), which also failed due to a mount error. The format failed due to not being able to mount the disk and I ran First Aid, which succeeded. When I plugged it in initially with a USB to SATA drive adapter it showed up in disk utility and I tried to format it as APFS.
The drive is a Seagate Laptop Thin HDD, 500gb (Model Number is ST500LM021).
I am running MacOS Catalina 10.15 on this laptop. I have bought a hard drive for my MacBook Pro 15” (Early 2009). (Please bear the long background, I want to explain all of the events that lead up to this problem)
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