I was just toying with idea to give myself more space and allow each linux I have breathing room.
Do you plan on running virtual machines or some other task that requires lots of storage?
I ask this because Linux, unlike Windows, doesn't hog a HDD's space, unless a lot of data is being stored on the system, or data partition(s) on these. Going over your Speccy specs again, that 698MiB HDD is a lot of room for two Linux installs, that's roughly 348GiB each, with 40GiB space for root (it doesn't grow a lot post install) & 308GiB for /home, where your personal data is stored, and for the sake of balancing things, a 2GiB Swap space between the two drives. Even with that, you could have 3-4 virtual machines & room for your files. /home is also where much of your configuration files for browsers & other software goes, these doesn't use a lot of space.
I also agree there's not much value in a 160GiB HDD (when 1TiB ones are on promo for $45 or so), yet it can still be very useful for storing files that you don't want on your OS drives. It's certainly not dead weight & after formatting, there should still be around 149GiB left, I have a couple of these myself & another on the way with a PC purchased, plus a few 120 & 80GB drives. Most aren't gathering dust, rather being used to store files on, or used as backup drives for notebooks. A 160GiB HDD will hold about 3 backups of each of my lesser used notebooks, about 2 of my most used ones, this is why having a docking station is so sweet, one can reuse 2.5" & 3.5" HDD's for backups/other data storage.
After taking a 2nd peek at your Speccy specs, if you really want to add a 3rd drive, IMO it should be a 250-500GiB SSD for Windows at a minimum, after creation of your Recovery Media set (if OEM PC) & imaging the entire HDD. There are some 250GiB models (though avoid Samsung EVO models like the plague) for $$69-79 or so on promo that reads at over 500MB/sec & writes in the upper 400MB/sec (or more). Both Crucial & SanDisk has some decent models in this price range. If the PC is under warranty still, leave the 1TiB HDD as is until it runs out, then use it as you please. The OS can be cloned to the SSD using Macrium Reflect, will have to run disk cleanup as Administrator to free up junk files, then move all of your personal documents to another drive & run a couple of defrag passes & using Disk Management, shrink the HDD as far as it'll go, & disable hibernation & System Restore. If by chance you can't shrink to 120GiB with the Windows tool, then use Mini Tool Partition Wizard Bootable ISO, can be used as a bootable USB stick or burned to CD, which can be booted to and a shrink can be forced, as long as there's no more than 120GB of data (preferably 80GiB or less) on the drive afterwards. Once Mini Tool is closed, remove the CD, the system will require one or two reboots.
It's now ready to clone, unless you choose to install Windows fresh. 7 can take a long time with all of the needed updates, but I'm not likely telling anything you don't already know. It's just that many prefers a fresh install on a SSD. BTW, if a OEM PC, the Recovery partition can also be cloned to the SSD with Windows. After the mandatory reboot or two, reboot into Mini Tool Partition Wizard & mark Recovery as the Active partition, once you reboot, it'll load Windows factory fresh.
Then you can shrink the OS to 120GB, image your Recovery Partition to that 160GB HDD, and then delete it for the space for Linux. By doing this, it remains available for when needed. If you go with a 500GiB sized SSD, you can keep Recovery if desired, and allow more space for Windows (at least 250GiB), though using Mini Tool, move Recovery over to have at least 10% of free SSD space, then split the remainder as two Logical partitions for the root partitions for your Linux installs. Unlike Windows, Linux can boot from Logical partitions.
If it's not a OEM install, then with a 250GB SSD, you can allocate 120GiB for Windows (more if 500GiB SSD is chosen), and 40GiB for each Linux root partition & have tons of space on the two larger drives for Linux /home, Swap & Windows data. This will leave some unformatted space at the end of the SSD, that's OK, as a rule of thumb, SSD OEM's recommends leaving about 10% free for the controllers to perform their duties better & will allow for best speed. You need not be concerned with partition alignment with Linux, the installer with make the necessary adjustments. Just be sure the drives are in place how you like them first, if you move anything, then Linux Swap will have to be repaired (or manually mount after every boot with GParted).
You can then use the 160GiB HDD for storage of your most important files, photos & videos and we all have some. Often a docking station that mounts both 2.5" & 3.5" HDD/SSD's can be found for $25 or so on the Newegg site when on promo, if you're not on their list, you can sign right up for these to be delivered to your inbox with valuable discount codes that we cannot share here, per Forum rules. Link is a bit down the page, if you've never used their site, or haven't in some time.
Since you also have a Haswell CPU as I do, I felt it necessary to add the option of a SSD, it's the best 'bang for the buck' you can invest in your PC, the results are immediate & makes a powerful impact on everything you do with the PC.
Plus since you have lots of HDD space as it is, there's no need to purchase another, you have enough space to install a couple more Linux OS's, with a /home partition for each, though if you want the root on a SSD, would need the 500GiB model for sure. These starts at $129 & up on promo, though $149 is the regular price for some models. Again, I cannot stress enough, stay away from Samsung EVO models, no matter how bold their claims are, they're junk & Samsung burned many of those who purchased many of the 840 series, shipping a software patch for a hardware read defect. Someone on this very forum, in this section, just stated the same as I a couple of days back.
Good Luck, no matter what you do!
Edited by cat1092, 06 January 2016 - 02:42 AM.