Disk specifications are sometimes reported according to a “best case” approach, which is disk-format independent. Some parameters are quoted in the same way by both disk manufacturers and computer system vendors, an approach that can confuse you because they are not measuring the same thing. Sun uses disks from many different suppliers, including Seagate, IBM, Fujitsu, and Quantum. For example, the Seagate web site, http://www.seagate.com, contains complete specifications for all their recent disks. The system may call the disk a SUN2.1G, but if you use the format command to make an enquiry, as shown in Figure 8-5, or use the new iostat -E option in Solaris 2.6, you can find out the vendor and model of the disk.