I have a 4TB external SSD. Running Diskutil I get

/dev/disk3 (external, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *4.0 TB     disk3
   1:                        EFI EFI                     209.7 MB   disk3s1
   2:                 Apple_APFS Container disk7         2.2 TB     disk3s2
   3:                 Apple_Boot                         650.0 MB   disk3s6
   4:                 Apple_APFS Container disk4         1.8 TB     disk3s4

/dev/disk4 (synthesized):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      APFS Container Scheme -                      +1.8 TB     disk4
                                 Physical Store disk3s4
   1:                APFS Volume SSD 1015 - Data         1.6 TB     disk4s1
   2:                APFS Volume Preboot                 87.0 MB    disk4s2
   3:                APFS Volume Recovery                528.9 MB   disk4s3
   4:                APFS Volume VM                      19.3 GB    disk4s4

/dev/disk7 (synthesized):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      APFS Container Scheme -                      +2.2 TB     disk7
                                 Physical Store disk3s2

My goal is to have /dev/disk4 be the combined size (~4TB). It is now about 1/2 the size of the physical disk. 4TB is the size of the physical drive size, but it got split into 2 partitions as i was upgrading from Mojave to Catalina (long story as I couldn't just upgrade because the SSD was originally HFS). I did get rid of the HFS partition and converted to APFS. /dev/disk7 is now blank. /dev/disk4 is now my boot drive.

I really don't want to have to reformat the SSD (boot disk) if at all possible. I tried

sudo diskutil apfs resizeContainer disk4 0

but that didn't work.

Is this possible? I also tried using disk utility, but it didn't seem to want to resize up either.

Can someone steer me in the right direction? -- Thanks

  • 1
    Step 1: make sure you have a good backup first. The APFS tools don't seem to be as solid as they should be yet. Aug 26 '20 at 5:09
  • What version of macOS are you now running? Mojave or Catalina? If Catalina, then where is the volume named SSD 1015? Aug 28 '20 at 8:07

Things digressed after the posting. Without doing anything, the size of the physical disk also changed. I think there was corruption in the file system, although Disk Util found nothing. I saved everything, and reformatted the SSD. All seems OK now with proper sizes showing up.

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .