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Appendix K: Using Disk Mirroring
The overwrite cycle repeats: the system over writes previously recorded data on the internal hard
drive, and overwrites the
early data
on the external hard drive.
If using an array of several external USB hard drives (20 terabytes max; customized component
required), the system writes data to the first external hard drive, then to the second hard drive,
then to the third hard drive, etc. Once the final external hard drive is full, the system will overwrite
the earliest data on the first external hard drive. Visit
250 GB
INTERNAL
HDD 0%
500 GB
EXTERNAL
USB HDD 0%
INTERNAL
HDD 100%
500 GB
EXTERNAL
USB HDD
50%
250 GB
INTERNAL
HDD 0%
INTERNAL
HDD 100%
Disk Overwrite
500 GB
EXTERNAL
USB HDD
50%
500 GB
EXTERNAL
USB HDD
100%
Figure 37.1 Disk mirroring on a larger capacity external HDD
OLD DATA
NEW DATA
