Throughput optimized HDD
Even though SSD is the new standard, AWS offers hard disk EBS volumes for a cheaper price than the SSD ones. These are optimized for sequential I/O and cannot be used for boot volumes. They offer a burstable throughput, similar to the general purpose SSD.
Notice that there is already a default route volume here of 8 GB general purpose SSD. We could, of course, switch the Volume Type to Provisioned IOPS SSD (io1), or use the cheaper Magnetic (standard) storage. However, we get up to 30 GB of EBS general purpose SSD storage on the free tier, so we should definitely use that. We can also Add New Volume at this time if we would like, or we can add one later on. So, let's just leave it as the default and click Next: Add ...
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