I have read on the Iomega site that the disks are compatible on the 250M drive, but you could expect a performance hit. This is because the heads on a 250M drive are smaller to allow more data to be recorded on a 250M disk. When writing to a 100M disk, it has to write the same track more than once. See the other answers for specs. Rick Glazier ----- Original Message ----- From: Will Stephenson <[log in to unmask]> > I have a client who recently purchased a P2-400 Dell (running NT 4 w/SP 4 > workstation) with 128 ECC RAM, an 8G harddrive, and an internal (IDE) Zip > 250 MB drive for use as a file server for a Foxpro application. > > When writing to a 100MB Zip disk, 100 MB of data takes around 9 minutes. > When writing to a 250 MB disk, the same amount of data takes about 90 > seconds. Has anyone one on the list seen or heard of a similar situation ? > Or would anyone have an idea why ? PCBUILD's List Owner's: Bob Wright<[log in to unmask]> Drew Dunn<[log in to unmask]>