I've posted a couple of questions in the past regarding hard drive problems, but not quite like this one. Due to the fact that my Windows 7 installation has become especially sluggish lately, I've been looking at a number of possibilities for dealing with it, including a clean installation of everything. However, before doing so, I've been checking my hardware for any problems that may be involved also. It wasn't very long ago, that I checked the current hard drive that the system is installed on, and it passed with flying colors, but I just checked again, and it has a lot of very slow blocks on it now (like 3-6MBs), as can be seen in the screenshot below. What I noted is that most of the slow blocks are located approximately at the beginning of a partition that I have been using for a parking space for downloads. I do that because I've noticed that when downloading a video file, that it lands on the drive in a fairly fragmented manner, but when copy/pasting it to it final destination, it usually is placed there without any fragmentation. I also find it convenient to keep these files separate until I finish any organizational changes that I need to do first. Thinking about the location of those slow blocks, I remember a couple of discussion that I've had in the past regarding possible damage done by defragging a drive, because of moving data around. I often download as many as a couple dozen or more video files per day, meaning that the suspect area of block are rewritten very often. I know that a problem for SSDs is there limitation for being rewritten, but I was under the impression that Hard drives don't suffer from that problem...IS THAT REALLY TRUE? Whether it is or not, I'm going to look for a location for my parking partition that I care less about damaging in the future. Still, it relates to a number of aspects of system maintenance, that I would like to have a better understanding.