Windows 10: Compressing files using Xpress16K algorithm

I want to compress my entire partition C: with xpress16k ... user files, system files, ... all.



I just have a partition (c and i want to compress my entire partition with "xpress16k"

Anyone know if this is possible?


cd "c:"
compact /c /s /a /i /f /exe:xpress16k




PD: I was testing this in usb bootable with windows 10 and give me 100% errors. ... so What Its wrong?....




compact /c /s /a /i /f /exe:xpress16k "e:\*.*"


***Original title: I want to compress my entire partition C: with xpress16k***

:)

 

Compress files??

It all depends on the contents. Back in the early days of DVD games, they had plenty of space compared to CD's. So they left stuff uncompressed on the DVD itself. Compressing such ISO image would result in very high compression ratio. But these days, even DVD discs are becoming small and game companies are already using data compression to fit more data on the same DVD. And since you cannot compress already compressed data, you're seeing more and more of the 99% compresion ratio moments.

Good examples of such scenarios is when you want to compres uncompressed WAV file and a MP3 file. WAV is not compressed and you can decrease its size significantly. You might gain few kilobytes when trying to compress already compressed MP3. The same is with images. You can compress BMP images rather well but when compressing JPG images, you won't really gain anything as its already compressed.

There are few very specialized algorithms that may gain some more compression out of already compressed data, but the gains are usually very small and usually not worth the extra compression time needed to perform the compression itself. Plus you can only use them to compress very specific data files.

 

So I used KGB Archiver to compress a 10gb file into a 40mb file...

Exactly. Most compression programs change a series of 1s and/or 0s to a couple of digits, and stores the total file in a table of contents/index. If you've got a file with TONS of repeating digits, sure, but pictures? No way to get that kind of compression in the real world.


from an article on "How To Geek"

First, we installed Bastion and compressed its folder — about 863 MB in size of music, graphics, executable files, and various different types of documents:

• Zip (Windows 8.1): 746 MB (86.4% of the original size)
• Zip (WinZip): 745 MB (86.3% of the original size)
• RAR (WinRAR): 746 MB (86.4% of the original size)
• 7z (7-Zip): 734 MB (85% of the original size)

Next, we compressed Hotline Miami, which is 654 MB of data:

• Zip (Windows 8.1): 316 MB (48.3% of the original size)
• Zip (WinZip): 314 MB (48% of the original size)
• RAR (WinRAR): 307 MB (46.9% of the original size)
• 7z (7-Zip): 301 MB (46% of the original size)

I would not expect a great deal of change from those numbers in November of 2014 to now, nor would I expect any real-world files to come any where NEAR the compression rate of .4%.

 

compressing vs compactos


What are you asking? Did you look into it and found something you couldn't understand?

compact /compactos compacts some (but by no means all) files in the C:\Windows directory using the xpress4k algorithm. It does nothing with user files.

xpress4k is one of the options on the compact command all of which result in smaller compressed files than NTFS, but it is worse than xpress8K, xpress16k or LZX. Conversly xpress* use less CPU to extract than LZX. These other compression options are only avaliable manually where you specify the directory and if you use them the directory prompty forgets it is supposed to be compressed and so no new files are compressed at all.

Generally speaking NTFS compression is terrible and should not be used these days. You'll have to check performance for yourself but xpress8k or xpress16k will probably be the most efficient for any PC made in the last decade.

I use xpress16k (for most things) and then flag the directory with default in case I forget to re-do it.

Something like
$folder='C:\Users\Whatever'
compact /c /s /a /f /q /i /exe:xpress16k $folder\*
then
compact /c $folder