Hi
You did probably see an other message from gparted! You can make different choice in gparted:
- create a completely new table: all data become inaccessible any more - there is the case where all data are away (because the table is away!!!)
- shrink an actual partition WITHOUT to generate a new table: normally nothing worse happens - after the process, the big partition is smaller an generated place for new partition
- use the free room generated shrinking a partition, it would be the next step: you redefine the size so that you preserve a bit place for the swap (your future sda4, for ex. 2 GB) an generate in the rest of the free place an extended partition (200 GB - 2 GB for sda4 = 198 GB, your new sda3) being itself to subdivise in logical partition (sda5, for example 10 GB for SliTaz, sda6, for example 10 Gb for Puppy's frugal "installations", so the 4 .. 6 GB of all the *.sfs-packages offered by Lazy-Pup from RSH, etc, sda7 a development / build system, etc., sda8, for a saving copy of the one or the other, etc.)
Which SliTaz are you using?
SliTaz 4.0 and early rel. of 5 did not recognize my HD (as well as sometimes my Intel-Chips!) and it was not possible to install. I thing it was not a matter of Gparted, because it was the same for the other operators, including bash etc.
but I use the version of begin of March 2015 and it works wonderful really!
save if possible you data (a slow 64 GB USB stick did cost last week under 20 Euro at the good-quality-and-high-level-discounter of my country!)
and try to shrink your Windows partition
after that to create as well your sda3 (198 GB) as a big extended partition as your sda4 for swap (2 .. 8 Gb depending on your RAM) with Gparted
reboot
create now your sda5 with your wishing size (for ex. 10 GB in ext3 or ext4; I prefer ext4 but I never use any more some old software not able to read in ext4 - old software were not able to do it!)
and install you SliTaz correctly in it!
and good luck!