The DVD? Yes, and that was taken care of by the burning of the ISO to that disk.

Your new distribution? Yes. An install process, documentation, or both should guide you towards the requirements for the version which you are installing as to what their needs are for the boot partition. The easiest is to allow the install process to manage this. But there should be information available to guide you or explain what it is doing; in case you wish to know.

I think all partitions should be primary. It's literally been 20 years or more since I've specified something to be a secondary partition; my believe is that this capability is kept for some reason, but nothing I have use for.

As far as reserving space for another distribution, and thinking about that eight to sixteen gig recommendation . . .

For a desktop, everyday distribution which you intend to run and have programs installed; I personally would never go below 8. I'm a slow paced distribution trier. Which is to say that I pretty much only try new desktop distributions when I'm finally setting up a new personal system.

Suppose I want create two partitions, one 15Mb for main install "/", and second 15Mb reserved for another Linux distributive: how to arrange the remaining space, half of volume: it can be left as unallocated space?

Hi,

I am sure you mean 15GB and not 15Mb(Mega bit). But, yes 15GB should suffice for most Gnu/Linux. About half the 15GB would be for the install leaving the rest of the partition for storage. You might consider 'LVM';Hope this helps.
Have fun & enjoy!

Sure 15GB, my typo. Is it available some manual for Debian partman disk partitioner?

Hi,

Yes, read the quote in my post above or go to the wiki for more information.

Hope this helps.
Have fun & enjoy!

with no relation to LVM, is it possible to build a new partition with the unallocated space, or add unlallocated space to other partition when required?

Hi,

You can increase a partition size if the space is contiguous to that partition. If you wish then a move of a partition to other storage media using a partition utility like Clonezilla Live or parted can allow the means to rearrange a partition scheme. Word of caution, be sure to backup the drive in case you should screw things up.
Hope this helps.
Have fun & enjoy!

what is the order to create partitions? Should it be in that order?

swap
/ main ext4
/home ext4
/reserved space ext4

I say allocate 15-20 Gig for this install and leave the rest unpartitioned. You should have another larger drive for data. As EDDY1 says 60Gig is not a lot of space for data.

I have no separate drive for data, but there will be no bulk data on SSD, it's mainly for Linux stuff .

Be sure to consider that sometimes /boot has to be near beginning of drive.

Some opinions are that separate /boot is required, and some believe that it's not needed.

Sperate /boot is ok but for 1 or 2 distros not necessary.

Does it make sense to create separate /data partition instead of /home? What should be the main considerations for /data partition size?

Hi,

I would say that would depend on the file type. Video can require more space than a simple text file or pictures.
Hope this helps.
Have fun & enjoy!