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Although it has been only a few months since this system was opened for use on a campus-wide basis , we are very encouraged by the rate and pattern of acceptance by both users and local support staff . However , until recently there has been only a limited amount of quantitative physiological evidence to support this . Although we have found a high percentage of parasitized nymphs ( see Pickett et al. this volume ) , the number of parasitized nymphs surviving until early spring has been only a small fraction of the initial number of whitefly eggs . It has been only a few short years since the largest drives available were under 20MB and a zip drive , a DOS disk , and a hex editor were a sufficient forensic toolset .