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evilmaniac
Jul 10, 2010
What operating system are you running ?
Are your external drives flash or mechanical ?

This sounds like your cache being exhausted (but I can't say for sure): The initial fast write you see is usually your operating system writing files into a fast-write cache that sits before the drive's permanent storage. Once the cache is full, your operating system can no longer write into the cache and needs to wait until more space is made available. This happens as your external drive begins flushing the cache (writing contents of the drive's cache into the drive's permanent memory). Writes to permanent memory are slow.

Could you link the external drives you are using ?

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