Data storage and preservation devices A variety of storage devices Main differences o Capacities from 1 GB to 10TB per unit o Prices from 1 to 300 for the same capacity o Very different reliability o Very different speeds Typical numbers in 2019 Capacity Latency $/TB Speed reliability per unit RAM 16GB 10ns 7000$ 10GBs-1 volatile SSD 500GB 10μs 200$ 1GBs-1 poor HD 6TB 3ms 25$ 150MBs-1 average Tape 20TB 100s 20$ 500MBs-1 good 4/62 S.Ponce-CERNData storage and preservation 4 / 62 S. Ponce - CERN devices // risks consistency safety c/c zoo A variety of storage devices Main differences Capacities from 1 GB to 10 TB per unit Prices from 1 to 300 for the same capacity Very different reliability Very different speeds Typical numbers in 2019 Capacity per unit Latency $/TB Speed reliability RAM 16 GB 10 ns 7000 ✩ 10 GB s−1 volatile SSD 500 GB 10 ➭s 200 ✩ 1 GB s−1 poor HD 6 TB 3 ms 25 ✩ 150 MB s−1 average Tape 20 TB 100 s 20 ✩ 500 MB s−1 good