What if the 2.5″ drives spin down but the 3.5″ drives don’t?
Now it’s 2.4 to 1 power savings in favor of 3.5″ Using 3.5″ drives – 1 drives *(8W *8Hrs +. What if the drives spin down (sleep) when not in use? Still about a 2 to 1 power savings in favor of 3.5″ If both drives were in use 24 hours:Ģ.5″ drives – 3 drives *(5.21W*24Hrs) = 375.1 Watt*Hours per dayģ.5″ drive1 – 1 drive * (8W*24) = 192 Watt*Hours per day Obviously there are a lot of other scenarios we can imagine. (assuming the drives don’t go into standby mode). Using 3.5″ drives – 1 drives *(8W *8Hrs + 5.4W*16Hrs) = 150.4 Watt*Hours per dayĬonclusion: Backing up to a 3.5″ hard drive uses half the power Let’s assume our backup job takes 8 hours per night and we need to backup 3TB: For this comparison we assume neither drive spins down or goes to standby mode:ġTB 2.5″ drive – Idle – 3.31 Watts, Typical operating 5.21 Watts, PowerChoice mode 1.2 WģTB 3.5″ drive – Idle – 5.4 Watts, Typical operating 8.0 Watts, Sleep Mode. Let’s compare the power usage of a Seagate Barracuda 3TB 3.5″ drive running at 7200 RPM to a 1TB Seagate Constellation (ST9100640NS) running at 7200 RPM. The largest 3.5″ drives have been 3TB, recently going to 4TB. For the past 2 years (2010-2012) the largest available 2.5″ drive has been 1TB. No surprise that total storage per drive runs about 3-4 times larger for 3.5″ compared to 2.5″. They also typically have 1.5 to 2 times as many platters. Would it surprise you to learn that 3.5 inch hard drives use less power than 2.5 for backup on a per Gigabyte stored basis?ģ.5″ disks have around twice the surface area of 2.5″ disks. We spend a lot of time studying backup to removable disk.
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