IBM expands its DS4000 series midrange disk storage offerings of high performance, high availability, and business-critical storage solutions, with the introduction of TotalStorage DS4800 Midrange Disk System Models 82 and 84.The TotalStorage DS4800 disk system addresses the needs of midrange/departmental storage requirements. The DS4800 delivers high performance, advanced function, and high availability, along with modular and scalable storage capacity, with SAN attached 4 Gbps FC connectivity. This disk system supports RAID levels 0, 1, 3, 5, and 10 up to over 67 TB physical capacity. The DS4800 can double IOP performance over the current DS4500 offering and represents the sixth-generation architecture of the DS4000 series family.A 4 U rack-mountable enclosure houses the DS4800 redundant, dual-active intelligent RAID controllers equipped with sixteen 4 Gbps ports (eight ports per controller), for attachment of host servers and DS4000 Storage Expansion Unit enclosures. The DS4800 attaches up to sixteen DS4000 Storage Expansion Units, supporting configurations up to over 67 TB of FC or Serial Advanced Technology Attachment (SATA) disks or a mix of both types of disk drives by use of the optional DS4800 FC/SATA Enclosure Intermix feature.