![]() I have kind of given up to format this floppy to more than 360kB, I'll just keep it as a curiosity. Thanks for mentioning FDFormat, but if I remember right, it requires the TSR FDRead to stay resident so that non-standard floppy formats can be read. Your MD2-HD 5.25" floppies are double-sided, but the floppy here is a single-sided one, I can't remember having seen one before. I've done it on the first attempt with some MD2-HD 5.25" Maxcell flopies I still have, by using FDFormat.Hi dencorso, With which DOS format parameters should this floppy be formatted on a 5.25" max.1.2MB floppy drive? Are there any special uses for this rare type of floppy disk? Edited Augby Multibooter The 2nd side of the floppy is a little weak. "Format b: /F:1.2 /u" formats the floppy Ok to 1.2MB, but with FMT v2.6 of the Disk Copy Plus utilites I got a bad sector (" 1 tries failed" ). "Format b: /1 /4 /u" formats the floppy Ok to 180K, but that's very little for a 96tpi floppy disk "If you do have any quad density disks, you can use them as good quality double density disks." Later on, the PC compatibles went to "high density" 1.2M 5.25" drives and diskettes, with drives which were able to run at 360 RPM." These drives, 40 or 80 track, rotated disks at 300 RPM. ![]() This was sometimes called "quad density", as it was twice the data capacity of "double density" 40-track (48 TPI) drives. "Many CP/M computers and some early IBM PC like computers used 80 track (96 TPI) 5.25 inch drives with double density format. Among the archived floppies, which I am re-formatting, I have come across a 5.25" floppy disk, marked as follows:
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