First on the subject of "CDD /D", it says in the docs that it removes the specified and drives or directory trees so I tried "CDD /S *" hoping that meant that it would remove everything and it took 4 or 5 minutes as a guess (I didn't "formally" time it; maybe I should have). However, after doing that deleting an existing (empty) directory on my Z: drive took 4:53.71 and then recreating that same directory took 1:18:48, not good but not terrible, either (although the "RD" really was terrible!). So then I found the jpstree.idx database in C:\Users\DanTheMan\AppData\Local\JPSoft and I renamed it to "jpstree-1.idx" (I was a little bit surprised that it allowed me to do that) and created a new, empty, jpstree.idx (">jpstree.idx") and deleting an existing directory took 0:00:00.01 and re-creating that same directory took 0:00:00.00(!!!) so the problem is solved (at least for now). However, I am a little surprised in that the previously-existing jpstree.idx database was only 4,224,688 bytes long, which I don't consider to be particularly large.
And, Steve, I use "subst" almost constantly because when I am working on any give "project" that has multiple files associated with it I "subst" the directory containing that project to a drive letter, and if I don't remember what drive letter it is (not all that unusual given my bad memory, of course) I use a "subst" command with no parameters to see which drive letter it is. At this minute I've got T: U: V: W: and Y: (not X: at the moment) subst'd, and Z: is always subst'd to J:. (Because of my bad memory I use very long and very "descriptive" directory (and file) names.)
Rex, as far as defragmenting goes, I have the standard Windows "Disk Defragmenter" set to automatically run every Wednesday at 1:00 AM (I am virtually always awake at 1:00AM on Wednesday mornings and therefore this computer is virtually always on at 1:00 AM Wednesday mornings). And as of this minute it reports that my C: drive is 3% fragmented and my D: drive is 8% fragmented, not too bad I would say.
And, Rex, I am not using compression on my hard drive(s). I tried that as a test several years ago, and I really didn't like something about it but I no longer remember exactly what that "something" was (no real surprise there) and I abandoned the whole idea. I thought an external hard drive (which I have) was a better solution in the long run. And I am using NTFS on all of my drives, even my RAM disk (it initially comes up formatted with some "version" of FAT, but I immediately reformatted it to NTFS. And I only had to do this once because it saves a disk-image of itself to a physical hard-disk (always to the same file so fragmentation is a non-issue) on system shutdown and reloads itself on system startup. It also "saves" itself to that file on a user-selectable schedule.
BTW, as kind of an ironic aside and a bit of a warning re. my (previous!) 1TB Iomega external hard drive: after it died (I lost a lot (about 250GB as I recall) of stuff that I really didn't need although the reason it was on that drive in the first place was because I thought that someday I might want/need some of it (a very good example of that is that I keep all "versions" of a program from the very beginning and I had placed all "previous" versions of everything I have ever written (almost 75 different programs) on that hard disk (96.8 and 98% full for the internal partitions of this laptop is the very simple reason why) and I thought that maybe I could get it replaced under warranty (I could not because it was out of warranty according to the Iomega website) and there was a phone number on the website that I understood was "help" of some kind if your drive was out of warranty. Well that wasn't what that telephone number was for (and I haven't quite figured out what the phone number was for), but at any rate the man I talked to at that phone number asked me what I was "complaining" about because those drives were only expected to "last" about 2 years!!!!! I somehow doubt that that is well-known. As soon as I get the funds (and a hard drive like the 2TB external hard drive becomes available - the other day the one I have was listed as being NOT AVAILABLE on the website of the vendor from which I had bought it) I will get a 2nd one - a "backup" for the "backup".
Again, thank you both.