You might try specrec in the gr-analysis module. It is optimized for fast writes but is Linux only. We routinely do 2.5 minute records at 25 MSPS sc16 format (100 Mbytes/sec sustained) with a b200 without typically dropping any samples. As mentioned, your hardware makes a big difference. We do this on a Samsung 840 EVO SSD and a generic dell laptop, so no raid required. Hope this helps.
https://github.com/garverp/gr-analysis Paul Garver
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