On Sat, Mar 17, 2012 at 6:08 PM, Al Kossow <aek at bitsavers.org> wrote:
  I have a small stack of single-sided disks that I need
to image, and
 didn't realize
 that they are 18 sector with 0-16 256 bytes and 17 128 bytes, so Imagedisk
 won't work.
 What is the preferred container format? Looks like the Australian museum
 uses .td0
 
I added IMD mixed-sector size support to SAMdisk (
http://simonowen.com/samdisk/) recently, so you could give that a try if
you have a Windows machine.  Try:  SAMdisk a: yourimage.imd     (add -h0 if
the disk is single-sided)
It should handle reading and writing most PC-compatible soft-sector
formats, if your FDC is up to it, including your existing .td0 images.