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The hard drive or SSD is constantly being read from while using navigation.
When using the radio or satellite radio, it is used to buffer the on air data including your DVD viewing.
That is why if you pull the drive your radio also stops working.
Btw the CIC can record radio programs to the HDD.
If there are issues writing and reading from the HDD you end up with pauses and performance issues with the CIC in general.
I have had an SSD in my car now going on five years without a single issue.
I don't see the system as "sensitive" but it requires very specific drives to work properly.
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