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A few weeks ago I updated an iMac with SSD to Catalina. After a while I noticed that the system drive had less than 5% space left. Not a healthy situation for the SSD.A quick review it appeared that all folders from the root / were duplicated in at /System/Volumes/Data/(base) iMac:.ssh user$ ls -ali / total 33 2 drwxr-xr-x 24 root admin 768 7 apr 13:31 . 2 drwxr-xr-x 24 root admin 768 7 apr 13:31 .. 1152921500311902268 -rw-rw-r-- 1 root admin 8196 7 apr 14:29 .DS_Store 1152921500312397577 d-wx--x--t 3 root wheel 96 7 apr 13:31 .Trashes 1152921500312397156 lrwxr-xr-x 1 root admin 36 19 mrt 09:16 .VolumeIcon.icns -> System/Volumes/Data/.VolumeIcon.icns 1152921500311902444 ---------- 1 root admin 0 13 dec 23:03 .file 1152921500311879696 drwx------ 9 root admin 288 7 apr 16:26 .fseventsd 1152921500312397157 drwxr-xr-x 2 root wheel 64 13 dec 23:02 .vol 8633670793 drwxrwxr-x+ 239 root admin 7648 11 apr 16:07 Applications 8633649746 drwxr-xr-x 82 root wheel 2624 20 mrt 01:00 Library 1152921500312397546 drwxr-xr-x 3 root wheel 96 19 nov 2017 Preboot 1152921500311902446 drwxr-xr-x@ 8 root wheel 256 23 jan 13:49 System 1704596 drwxr-xr-x 5 root admin 160 23 jan 13:47 Users 8633673123 drwxr-xr-x 7 root wheel 224 14 apr 21:12 Volumes 1152921500311902269 drwxr-xr-x@ 38 root wheel 1216 23 jan 13:58 bin 8633673124 drwxr-xr-x 2 root wheel 64 13 dec 23:07 cores 307 dr-xr-xr-x 3 root wheel 4509 14 apr 20:20 dev 1152921500311902445 lrwxr-xr-x@ 1 root admin 11 19 mrt 09:10 etc -> private/etc 1152921504606781440 lrwxr-xr-x 1 root wheel 25 14 apr 20:20 home -> /System/Volumes/Data/home 8633673122 drwxr-xr-x 2 root wheel 64 13 dec 23:10 opt 8633649229 drwxr-xr-x 6 root wheel 192 19 mrt 09:18 private 1152921500311902342 drwxr-xr-x@ 63 root wheel 2016 19 mrt 09:16 sbin 1152921500312397161 lrwxr-xr-x@ 1 root admin 11 19 mrt 09:16 tmp -> private/tmp 1152921500311879711 drwxr-xr-x@ 11 root wheel 352 19 mrt 09:16 usr 1152921500312397153 lrwxr-xr-x@ 1 root admin 11 19 mrt 09:16 var -> private/var(base) iMac:.ssh user$ ls -ali /System/Volumes/Data/ total 3458 1152921500311879682 drwxr-xr-x 31 root wheel 992 19 mrt 09:28 . 1152921500312303809 drwxr-xr-x 3 root wheel 96 13 dec 23:02 .. 8611277339 -rw-rw-r-- 1 root admin 10244 17 mrt 20:25 .DS_Store 25 -rw-rw-r--@ 1 root wheel 15364 30 aug 2010 .DS_Store (of old Mac) 26 d--x--x--x 9 root wheel 288 14 apr 20:20 .DocumentRevisions-V100 19 dr-xr-xr-t@ 2 root wheel 64 26 mrt 2017 .HFS+ Private Directory Data? 4183 drwx------ 2 user staff 64 11 dec 2016 .IABootFiles 8618393312 -rw-r--r-- 1 root wheel 992 16 sep 2019 .OSInstallerMessages 4185 drwxr-xr-x 2 root admin 64 21 okt 2016 .PKInstallSandboxManager 4186 drwx------ 2 root admin 64 19 mrt 00:07 .PKInstallSandboxManager-SystemSoftware 3473871 drwx------ 5 root wheel 160 26 mrt 2017 .Spotlight-V100 8633649745 -rw-r--r-- 1 root wheel 1729962 19 mrt 09:17 .TempReceipt.bom 3479439 d-wx--x--t 3 root wheel 96 26 mrt 2017 .TemporaryItems 3693106 d-wx--x--t 3 root wheel 96 7 apr 13:31 .Trashes 8611277340 ---------- 1 root admin 0 26 feb 2019 .file 3472750 drwx------ 219 root wheel 7008 14 apr 21:14 .fseventsd 8633649744 -rw-r--r-- 1 root wheel 424 15 jan 05:41 .installer-compatibility 8611277341 drwxr-xr-x 2 root wheel 64 15 apr 2019 .vol 8633670793 drwxrwxr-x+ 239 root admin 7648 11 apr 16:07 Applications 1140515 lrwxr-xr-x 1 root wheel 42 11 dec 2016 Developer -> /Applications/Xcode.app/Contents/Developer 8633649746 drwxr-xr-x 82 root wheel 2624 20 mrt 01:00 Library 8633667995 drwxr-xr-x@ 3 root wheel 96 14 dec 02:25 System 1704596 drwxr-xr-x 5 root admin 160 23 jan 13:47 Users 8633673123 drwxr-xr-x 7 root wheel 224 14 apr 21:12 Volumes 8633673124 drwxr-xr-x 2 root wheel 64 13 dec 23:07 cores 3 dr-xr-xr-x 2 root wheel 1 14 apr 20:26 home 8633670084 drwxr-xr-x 2 root wheel 64 13 dec 23:03 mnt 8633673122 drwxr-xr-x 2 root wheel 64 13 dec 23:10 opt 8633649229 drwxr-xr-x 6 root wheel 192 19 mrt 09:18 private 8633649412 drwxr-xr-x 2 root wheel 64 13 dec 23:03 sw 8633649414 drwxr-xr-x 5 root wheel 160 23 jan 13:35 usrThe filesystems appear to be linked. When I remove a file from /Users/user/Desktop/ it is also removed from /System/Volumes/Data/Users/user/Desktop/Is it default Catalina firmlink behaviour or is there a way to unlink the two filesystems and reclaim most of the diskspace by deleting one or the other?