Promise Technology

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Promise Technology manufactures ATA and SATA (RAID) controllers, which usually feature Promise chips for the device interface and no RAID CPU, therefore they are "soft-RAIDs".

Almost everyone has some stories to tell about the usage of Promise controllers, most of these end with "stay away from Promise".

Common to these trouble reports are:

  • Controller is used with an OS that is not Windows
  • More-than-nothing I/O
  • Log entries like "... tried to write beyond end of device ..."
  • RAID/Data was missing after a reboot
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