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Disk and disk controller selection

Most PC systems use a single disk to host the operating system and to store application data, as the size and data rates are increasing rapidly. Disk interfacing is achieved using the SATA interface (Serial ATA).

With falling costs and greater availability, solid state disks (SSDs) are also frequently used as they offer higher shock and vibration resistance as well as a higher bandwidth. Modern disks deliver a sustained rate of around 100 MB/s in a sequential write, whereas solid state disks can increase this tenfold, even when not writing sequentially.

Using RAID-technology (Redundant Array of Independent Disks), extremely powerful recording systems can be set-up. RAID arrays are available in different configurations, with the file I/O being handled by a specialist RAID controller that improves the data redundancy and throughput rates of the disks.

There are many RAID configurations, but the most commonly used in vision applications is RAID 0. This 'stripes' the data across multiple disks, increasing the bandwidth of recording. The other common configuration of RAID for machine vision is RAID 1 where a data redundancy is achieved by mirroring of the disks RAID 0 systems are not secured against failure of single disks.