winston19842005 wrote: (snip)
And what really stinks is that 5.25in are hard to determine. Just look at a 3.5", if it has a hole across from the write protect, it is HD.
Some years ago I bought some of each. To avoid this problem I bought HD disks in blue and DD in black.
5.25in? Well, unless it is in the box, it is hard to determine (even if it is in the box, see below). I got a shipment of new disks, no sleeves, in plastic wrap, plus some other make that were labeled DSDD. I've found that MANY HD 5.25" do not have hub rings. Some of these DSDD didn't have the hub rings, and were in fact, DSHD. They would format fine in an HD drive, but not in a regular drive.
However, I've had supposed HD disks (no hub rings from an HD box new) that formatted great in a regular drive, but not to HD. So apparently even the manufacturers get them mixed up.
When I used to use 96tpi DD disks I remember that some didn't use hub rings because it made the disk alignment less accurate. I don't know that I ever believe that, but that was the reason I remember. -- glen