[NAME], The old post linked above is pretty much still applicable.  But, yeah, Dell has added even more minor partitions.  My wife's Dell 5400 has the same partition layout on her 256 GB SSD drive.  The difference being that the main "C:/" partition is only 221 GB (because, well, smaller...), and the second "Recovery Partition" is 14.58 GB instead of 17 GB.  There is also a 16 MB unallocated space that, well, just sits there.  My son's 3891 with a 256 GB SSD is the same way. Pretty sure that the 14+ GB partition is the full Windows installation files. Others are likely additional drivers and such that will likely never be needed. We actually added a 2TB hard drive on my wife's computer because she does a ton of work with audio files and photos, and I knew that 256 wouldn't be nearly enough.  I added a 1 TB hard drive to my son's PC. My PC is one I built, and installing Windows on my 500 GB SSD automatically created only 2 additional partitions besides the primary boot partition. The first EFI System partition that;s only 100 MB, and the ending 508 MB Recovery Partition.  So, it's a Dell thing.  I'm sure HP, Acer, and Lenovo do similar things. It's not a problem to save apps and user data to another drive.  I do it on all three of our machines.  Most apps let you specify which folder to save to.  Saving your data can be a little tricky.  But you can generally change the default location for Docs, Pics, Videos, Downloads and 3D Objects by right-clicking on the user folder icons in the File Explorer > click "Properties" > click "Location" tab >  then just change C:\Users\your-username\Documents to D:\Users\your-username\Documents.  You can just type in the whole path if you want and it will ask to create one if one is not already there, then ask if you want to move the existing files to the new location.  Click "yes". Now, Win 10 and Win 11 both have another default document save location in the main "Settings" > "System" > "Storage" > look for "Change where new content it saved".  That only specifies the drive letter to save apps, docs, music, photos and a few other things.  But it only sets the drive letter, and doing so creates the D:\your-username\Docs, etc..., and does not use the main "Users" folder first.  So changing the drive letter here creates 2 your-username folders.  One in the root of the selected drive, and one under the 'Users" folder.  And, of course, the "your-username" is usually your MS account or login name.  
My new 3891 desktop has just the single 512 GB NVMe drive which is much larger than I should need.  But I'm stymied that looking at the partition sizes, there are nearly 20 GB allocated to 3 "recovery" partitions.  Why?  Are all those committed to realistic purposes? (Total  HD contents of my old Win 7 PC, used about 168 GB in C: & combined.)  But looking at the new NVMe to see where to create a partition, I'm puzzled.  There are 5 "volumes" and only the C: partition is lettered (NTFS format).  Here's the graphical order of volumes/ partitions, all shown healthy:  (#s below are as noted by Disk Mgmt, look inconsistent; I've indented the smaller, "MB" sizes) #1        150 MB      -(EFI system ptn, shown crosshatched)       456.7 GB    -OS (C:)  (Windows 10)  Disk 0, "online" #4         990 MB     -"Recovery" #5    17.4 GB     -"Recovery" #6     1.36 GB    -"Recovery"   Obvious question:  Does it really need all those 3 "Recovery" partitions, and for what? (Secondly, all volumes shown total about 477 GB; where are the other 35 GB?) Mainly, can I reallocate some of those latter 19 GB or so, for a partition (and I suppose reduce the size of C: also?  (My wife's new Dell 3080 has all her apps on the 256 GB SSD, and my old C: drive on the W7 machine shows only some 100 GB used.)  OR, for apps and their files , do I need to really need to add a second physical drive?  (or perhaps Windows 10 likes all apps AND files on the C: partition?) Thanks for your more-expert tips.  The puzzles grew as I added this up.
Insp.3891 - Too many "Recovery" partitions _??