If an ethernet card or other card is plugged into a Viglen PC which uses an early version of the JAC-Up II motherboard and has a Quantum hard disk drive, data onthe hard disk can become corrupted in some cases. Only some systems fitted with Quantum hard disk drives are affected and only under some circumstances.
Susceptible systems operate perfectly until an adapter card such as an ethernet card is fitted.
The presence of the new card may then cause the hard disk to malfunction, corrupting data when information is written to the hard disk. Replacement of the hard disk with a drive from a different manufacturer cures the problem. We have also requested a non-destructive means of identifying problem systems and will advise about drive replacement when we have more information. For now, DO NOT install cards into these systems if they have a Quantum drive. The hard disk drive is mounetd vertically at the right-hand rear of the machine, the manufacturer's label should be clearly visible.