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Hard Disk Drive (HDD) controllers are pieces of computer hardware that connect directly to the motherboard allowing you to add more hard drives to your system by hooking them up via the HDD controller. This can be for a number of reasons such as increasing the storage size, hard-drive mirroring or for hot-swapping where a drive can be removed without powering the system down. The controller features its own processor which allows you to bypass the motherboard's own limitations on controlling hard drives. Some HDD controllers allow the use of RAID (redundant array of independent disks) features that provide either higher speeds or more reliability.
These controller cards are entry-level models that use a 1x PCI-E slot in order to provide faster SATA performance that any standard storage connector can provide. The products in this category have two connections for small-scale RAID arrays, and some work in Macs as well as PCs.
The controller cards in this category provide storage speeds far in advance of the standard SATA ports inside desktop PCs and office workstations. These products are mid-range components with four connectors.
These eight-port storage controller cards offer more versatility than many of their counterparts and can be used to configure RAID 0, 1, 5, 10, 50 and JBOD arrays. They're low-profile cards that use PCI-E connections, so can be fitted to most PCs without conflicting with other hardware.
These cards can be installed inside desktop PCs to provide professional-level storage capabilities. They use the increased speed offered by the PCI Express bus in order to facilitate super-fast RAID configurations, and the cards in this category include between 12 and 32 ports - perfect for the most demanding of corporate setups.
These additional add-on cards enable to add more SATA/SAS/eSATA drives to your system to give more storage capacity according to the card type. Some of these cards also allow the use of RAID thus increasing the performance and data security.
Serial Attached SCSI (SAS) builds on the proven SCSI protocol to provide performance, reliability, flexibility, and massive scalability. Here is a range of controllers for use with Serial ATA (SATA), Serial Attached SCSI (SAS) drives, including Unified Serial™ cards which can be used with both SATA and SAS drives. With leading price performance, storage management tools, and support, they provide the best value for meeting evolving storage needs.
A simple disk array controller may be integrated with a host bus adapter (HBA) to form a single adapter to easily fit inside a computer. These cards allow the use of SCSI drives within a system that does not usually have SCSI ports. The RAID controllers allow the use of the various types of RAID when used with multiple hard-drives thus increasing the performance and data security.
A simple disk array controller may be integrated with a host bus adapter (HBA) to form a single adapter to easily fit inside a computer. These additional add-in cards allow you to add more IDE or Serial ATA drives to your system to give you more storage capacity. Some of these cards also allow the use of RAID thus increasing the performance and data security.