1. VDURA claims that HDD systems have lower carbon emissions than flash arrays. 2. Michael Barrell, VDURA's senior systems architect, argues that modern HDD systems are 54-60% more favorable in terms of CO2e emissions. 3. Barrell's analysis shows significant improvements in HDD technology, with a 30TB HDD potentially having 50% lower CO2 emissions than a 12TB HDD.