I've always used fmsdisk.device to create 4 virtual floppies on my HDD.
All DMS and ADF files get written to these virtual floppies. Much quicker, more reliable, and you can Virus Check the unarchived disks much faster too.
Here's the Aminet link to the archive:
http://www.aminet.net/disk/misc/fms_20.lhaUse the supplied instructions in the guide to get everything set-up. You can tweak it further, and if you need any advice on doing so, let me know and I will post a detailed guide sometime tomorrow when I am back on my Amiga...
Good Luck.