system
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My temp is and was on an another drive, as I said in the post before. The environment variables, both TMP and TEMP are and were set onto another drive.
On SSD-s the 1 GB written data doesn’t mean that exactly 1GB was written to disk. If 4KB is the smallest size that an SSD can handle, then even a 1Byte write results a 4KB write onto the disk. Also a 2*1 Byte write into the same 4MB file but on different places can result 8KB or more data actually written to the disk.
SSD needs some different handling. Example I couldn’t find any info on this but I’m yet to see a cache file in Firefox’s Cache folder which is less then 3KB size (real size). Maybe this is the reason.