The former 3.5-inch device offers huge capacity, the latter breakneck speeds. Seagate claims its 60TB SAS (Serial Attached SCSI) SSD is the largest ever demonstrated. More specifically it says the 3.5-inch format drive offers "twice the density and four times the capacity of the next highest-capacity SSD available today". If you like 'equivalent to' figures, you could say this drive has enough capacity for around 400 million photos, or for a collection of 12,000 DVDs.