Custom Install, Essential System Software

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Snow Leopard
Dmg Size: 6.13 GB
Essential System Software: 3.6 GB
Essential System Software: 8.12 GB (after erase the disk with Disk Utility)

1. Can someone explain, where the difference of GB come from?

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Lion
Dmg Size: 3.49 GB (without Printers, Developer Tools, Fonts..)

2. Can I clean the disk for proper install or does it require Snow Leopard System files?
I installed it on cleaned disk. Filesystem and storage management were low.
 
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Your Mac's Specs
Silver M1 iMac 512/16/8/8 macOS 11.6
Well SL comes on a DVD and not a .dmg file. You need to boot from the SL DVD, pop it in and restart, immediately after the chime hold down 'C', leave Installer and go to Utilities > Disk Utility > Erase Disk, format Mac OS Extended and in Partition select GUID.

Then back to Installer and proceed. If you downloaded SL which is against EULA, then a .dmg is always much smaller that the opened file.
 
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sry, you misunderstand my question

I've tested it on same Model, MacBook Late 2008. USB install, the source file was the same.

without "erase disk" 3.81 GB
03installrosetta.jpg


with "erase disk"
8.12 GB (german)
2011-12-1722.19.54ul2vu.jpg
 
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Your Mac's Specs
Silver M1 iMac 512/16/8/8 macOS 11.6
Sounds like you are illegally installing if it is from USB and not a full retail install DVD.
 
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You can install all Mac OS from USB, why should it be illegal? I could download the dmg files from Education Server of my school. Or you can backup your DVDs to dmg.
 

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