Win 10 Compact feature: Better Compatible? compression!

[brutus1]

Haha, that definitely brings back memories of the early days of disk compression! I remember Drivespace and its algorithms from the MS-DOS and Windows 95 era — Standard, HiPack, UltraPack — each with its quirks. It's funny how the highest compression back then relied on background tasks during idle times instead of the real-time processing we're accustomed to now. Things have certainly come a long way since then!

[Kalex]

Windows 10 comes with a new compression feature called Compact/CompactOS:

It's generally faster (multi threaded?) than Windows compression
BUT
the main advantage is that it does NOT:
1st write the uncompressed file to disk,
Then also the compressed file
Then compare sizes
Then erase the uncompressed version if its bigger, or the compressed version if it is not

It actually DOES this.
There's not much difference, except for Windows Explorer has only the outdated LZNT1-Algorithm implemented and compact.exe the other four (XPRESS* and LZX).
Regarding their compression and de-compression, they work the same on system level AFAIK.
And as stated correctly before, as PrimoCache doesn't care much for file systems, but for blocks, both technologies shouldn't interfere with each other beside the effect of PrimoCache being able to cache more compressed files as these fit in less blocks than uncompressed files would.