I reinstalled the OS fine. Did I damage my system?
Recovering from an external drive failure on Mac | Mostly Technical
This highlights how well Apple typically hides some of the fussy details of an operating system from users, usually to the good: What Carmela is seeing is the difference between a drive and a partition. Only a handful of firms make hard drives. However, the physical disk is useless without being formatted or prepared to store the data in a particular way that an operating system can read.
When you format a disk, you partition it into one or more logical volumes.
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Each volume can have a separate formatting scheme. Please continue with the next step.
Please stop here and add a comment. Depending on the size of the disk and the system version differently sized EFI volumes are built if partitioned with Disk Utility: Here it's obvious that your disk contains a MiB EFI and probably bytes of unallocated disk space: Since you moved the "corrupted" disk to a different case and disk controller the logical block size was modified.
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The old partition map is probably based on a logical block size of Bytes. To recover the partition map in the old b case you would had to enter the following to restore the GPT based on David Anderson's answer:. Based on the b part this "retranslates" after installing the disk in a b logical block size case to:. This differs from the first accepted part of my answer but is the proper one!
Since the EFI actually is "empty" and the unallocated blocks contain zeros only, the "first and somehow wrong" answer doesn't affect the operability of the volume.
This is not an answer, but rather an example of how to extract the GPT partition information from the data you presented. The secondary backup GPT partition entries were used because you did not post the contents of the primary GPT partition entries.
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Home Questions Tags Users Unanswered. I can't think of any specific use or event that may have caused the change. Here is the information I've collected from the drive. Yes Part of Whole: Not applicable no file system Mounted: Not applicable no file system File System: None Content IOContent: No Media Type: Generic Protocol: Not Supported Total Size: Not applicable no file system Device Block Size: No Read-Only Volume: Not applicable no file system Device Location: External Removable Media: Disk Utility shows internal drives and connected external drives like USB drives , as well as special image files DMG files that you can mount and access as drives.
Recovering from an external drive failure on Mac
You can adjust the partitioning layout scheme here. You can also resize, delete, create, rename, and reformat partitions. APFS Explained: APFS volumes. One of them: This feature checks the file system for errors and attempts to correct them, all without much intervention from you. The Erase button allows you to erase an entire hard disk or partition. You can also choose to only erase its free space.
You can use this feature to securely wipe a hard drive. One pass should be good enough , but you can always do a few more if you feel like it. The maximum number is unnecessary.
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