1 - I noticed that the hard disk was left with only 499kb. Is that correct?
Yes that's correct, sectors that don't contain data are not written to the CHD. It will grow bit by bit after you partition, format and install DOS on it
Just copy the drivers from your boot disk (in the screenshot above it shows the CD ROM driver successfully loaded) to the new system and put the corresponding lines in your CONFIG.SYS/AUTOEXEC.BAT
Within the disk, there was a file with some instructions. I copy the file to C:\dos I modified the autoexec.bat I modified the config.sys And this error happened