"other volumes" on my SSD.

[elf69]

What is this other volumes space?.
This was a clean install of High Sierra NOT an upgrade.

I'm thinking of swapping the SSD as it seems slow with black magic app.
But also it is too small anyway.

 

[Weaselboy]

That is normal for APFS. That Other includes some hidden partitions used by the OS. If you run the command "diskutil list" in Terminal it will show them.

/dev/disk0 (internal):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                         251.0 GB   disk0
   1:                        EFI EFI                     314.6 MB   disk0s1
   2:                 Apple_APFS Container disk1         250.0 GB   disk0s2

/dev/disk1 (synthesized):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      APFS Container Scheme -                      +250.0 GB   disk1
                                 Physical Store disk0s2
   1:                APFS Volume Macintosh HD            63.1 GB    disk1s1
   2:                APFS Volume Preboot                 18.7 MB    disk1s2
   3:                APFS Volume Recovery                506.6 MB   disk1s3
   4:                APFS Volume VM                      1.1 GB     disk1s4