My iMac has this sometimes, particularly with the Photos app, whats the procedure to check the HD, I’ve got a 3Tb Fusion drive? I ran a First-Aid using Disk Utility, is that it? The drive itself is shown as two components in System Information…
Macintosh HD:
Available: 1.01 TB (1,012,032,503,808 bytes)
Capacity: 3.11 TB (3,114,534,961,152 bytes)
Mount Point: /
File System: Journaled HFS+
Writable: Yes
Ignore Ownership: No
BSD Name: disk3
Volume UUID: 857F23F5-65A9-3EEB-B7E5-FCC6AA43FED3
Logical Volume:
Revertible: No
Encrypted: No
LV UUID: B6DBE08F-D0F4-49CF-BA88-6EF7748E07AF
Logical Volume Group:
Name: Macintosh HD
Size: 3.12 TB (3,120,721,960,960 bytes)
Free Space: 131 KB (131,072 bytes)
LVG UUID: 30837CB7-A57C-4EC8-AF72-3427B1BC4477
Physical Volumes:
disk0s2:
Device Name: APPLE SSD SD0128F
Media Name: APPLE SSD SD0128F Media
Size: 120.99 GB (120,988,852,224 bytes)
Medium Type: SSD
Protocol: PCI
Internal: Yes
Partition Map Type: GPT (GUID Partition Table)
Status: Online
S.M.A.R.T. Status: Verified
PV UUID: 1D0322AE-F13D-4C85-9A40-D4D7F76D537C
disk1s2:
Device Name: APPLE HDD ST3000DM001
Media Name: APPLE HDD ST3000DM001 Media
Size: 3 TB (2,999,733,108,736 bytes)
Medium Type: Rotational
Protocol: SATA
Internal: Yes
Partition Map Type: GPT (GUID Partition Table)
Status: Online
S.M.A.R.T. Status: Verified
PV UUID: 036675FB-2502-42F5-BAE4-8CE54F86045D