In computer hardware, a host controller, host adapter, or host bus adapter (HBA) connects a host arrangement (the computer) to added arrangement and accumulator devices. The agreement are primarily acclimated to accredit to accessories for abutting SCSI, Fibre Channel and eSATA devices, but accessories for abutting to IDE, Ethernet, FireWire, USB and added systems may aswell be alleged host adapters. Recently, the appearance of iSCSI and Fibre Channel over Ethernet has brought about Ethernet HBAs, which are altered from Ethernet NICs in that they cover TCP Offload Engines. There are aswell converged HBAs that abutment both Ethernet and Fibre Channel alleged Converged Arrangement Adapters (CNAs).
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