We are often asked what the difference between the S250 & D250 devices are. For the technical rundown you can check out our specifications page.
Imation describe the differences as:
Imation Basic S250 Series: High-performance and extra long-lasting S250 drives are built to stand up to continuous use on the road. Dual-channel SLC flash memory delivers exceptional performance and longevity.
Imation Basic D250 Series: D250 drives balance performance and value for users with average data access needs. Same great security as the S250, with dual-channel MLC flash memory for reliable read/write performance.
You can view our full range of Ironkey Basic devices here.