Single- and dual-channel Ultra320 SCSI host bus adapters for the Mac are now available from the storage-infrastructure specialists at, and, a designer and manufacturer of communications, consumer and storage semiconductors. LSI Logic's Ultra320 SCSI controllers, the LSI53C1020 and LSI 53C1030, use Fusion-MPT (Message Passing Technology) architecture to deliver double the data-transfer speed of current Ultra160 SCSI technology, according to Dave Snell, chief technology officer for ATTO. Snell indicated that the ATTO ExpressPCI UL4S and UL4D SCSI HBAs is suited for digital audio/video, Web authoring, prepress and video streaming. ATTO Technology products with LSI Logic architecture are the first Mac-platform Ultra320 SCSI HBAs to be introduced and ship in production volumes, Snell said.

The ATTO Express PCI UL4D/S Ultra320 SCSI HBAs provide Mac users with features like packetized SCSI, Quick Arbitration Select (QAS), pre-compensation techniques, and flow control that allow data to be transferred faster. Packetized SCSI transfers grouped commands, messages and status bytes at full data-transfer speeds, reducing the protocol overhead. Even better, packetization allows the transfer of several commands or data from multiple I/O processes in a single connection. By eliminating bus free time, QAS reduces the device selection time and bus arbitration, Snell said. The UL4S/UL4D HBAs will incorporate 64-bit/133 MHz PCI-X functionality while retaining backward compatibility with earlier SCSI versions.

This means your existing peripheral devices won't be orphaned. This story, 'ATTO ships Ultra320 SCSI host bus adapter' was originally published.

SCSI host bus adapter (a card) In, a host controller, host adapter, or host bus adapter ( HBA) connects a, which acts as the host system, to other and devices. The terms are primarily used to refer to devices for connecting, and devices.

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However, devices for connecting to, and other systems may also be called host adapters. The term (NIC) is more often used for devices connecting to computer networks, while the term can be applied when protocols such as or allow storage and network functionality over the same physical connection. These can include. Main article: A SCSI host adapter connects host system to boot from a SCSI device, but also facilitates configuration of the host adapter. Typically a, linked to the, controls the host adapter itself. In a typical subsystem, each device has assigned to it a unique numerical ID. As a rule, the host adapter appears as SCSI ID 7, which gives it the highest priority on the SCSI bus (priority descends as the SCSI ID descends; on a 16-bit or 'wide' bus, ID 8 has the lowest priority, a feature that maintains compatibility with the priority scheme of the 8-bit or 'narrow' bus).

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The host adapter usually assumes the role of, in that it issues commands to other SCSI devices. A computer can contain more than one host adapter, which can greatly increase the number of SCSI devices available. Major SCSI adapter manufacturers are,. LSI, Adaptec, and ATTO offer PCIe SCSI adapters which fit in Apple Mac, on Intel PCs, and low-profile motherboards which lack SCSI support due to the inclusion of SAS and/or SATA connectivity.

Fibre Channel The term host bus adapter (HBA) is most often used to refer to a interface card. Fibre Channel HBAs are available for, computer architectures, and buses, including and (obsolete today).

Each HBA has a unique (WWN), which is similar to an Ethernet in that it uses an assigned by the. However, WWNs are longer (8 bytes). There are two types of WWNs on a HBA; a node WWN (WWNN), which is shared by all ports on a host bus adapter, and a port WWN (WWPN), which is unique to each port. There are HBA models of different speeds: 1Gbit/s, 2Gbit/s, 4Gbit/s, 8Gbit/s, 10Gbit/s, 16Gbit/s and 20Gbit/s. The major Fibre Channel HBA manufacturers are. As of mid-2009, these vendors shared approximately 90% of the market.

Other manufacturers include,. HBA is also known to be interpreted as High Bandwidth Adapter in cases of Fibre Channel controllers. InfiniBand The term host channel adapter (HCA) is usually used to describe interface cards. ATA ATA host adapters are integrated into motherboards of most modern.

They are often improperly called disk controllers. The correct term for the component that allows a computer to talk to a peripheral bus is host adapter. A proper only allows a disk to talk to the same bus. SAS and SATA or serial-attached SCSI is the current connectivity to replace the previous generation parallel-attached SCSI (PAS) devices. Ultra320 was the highest level of parallel SCSI available, but SAS has since replaced it as the highest-performing SCSI technology.

Is a similar technology from the aspect of connection options. HBAs can be created using a single connector to connect both SAS and SATA devices. Major SAS/SATA adapter manufacturers are Promise Technologies, Areca,. ESATA and drives are increasingly common in the consumer computing market, but not all SATA-compatible motherboards and include external SATA ports. As such, adapters to connect external SATA devices to ports on an internal SATA bus are commonly available.

Mainframe I/O channels. Main article: In the field, the terms host adapter or host bus adapter were traditionally not used. A similar goal was achieved since the 1960s with a different technique:, or simply channel, is a separate processor that can access independently, in parallel with CPU (like later in field), and that executes its own I/O-dedicated when pointed to such by the controlling CPU.

Protocols used by I/O channels to communicate with include and newer. See also. for USB and FireWire host adapter information References.