CS157b
Chris Pollett
Jan 24, 2018
Metric | Power 2 |
---|---|
1KB (or 1kB) (one kilobyte) = 1,000B | 1KiB =`2^{10}`B = 1024B |
1MB = 1,000,000B | 1MiB =`2^{20}`B = 1024KiB |
1GB = `10^{9}`B | 1GiB =`2^{30}`B = 1024MiB |
1TB (one terabyte) = `10^{12}`B | 1TiB =`2^{40}`B = 1024GiB |
1PB (one petabyte) = `10^{15}`B | 1PiB =`2^{50}`B = 1024TiB |
1EB (one exabyte) = `10^{18}`B | 1EiB =`2^{60}`B = 1024PiB |
Death Master File (SSNs of people who have died in US since start of social security) | ~1.5Gb |
UTZoo Archive compressed posts of Usenet from 1981 to 1991 | ~3Gb |
Mozilla Addons circa 2008 | 4Gb |
Compressed English Wikipedia Page Dump (not indexed) | 15Gb |
Open Street Map circa 2013 | 3Tb |
All Wikipedia as stored in DB Excluding Blobs circa 2012 | 5Tb |
Indexed 1 billion page web crawl on yioop.com circa 2014 | 24Tb |
Text Portion of Library of Congress circa 2010 | 20Tb |
All Wikipedia as stored in DB with Blobs circa 2012 | 27Tb |
A disk controller is a small processor in an HDD capable of:
Several components make up the time from a read/write request until the block appears in main memory (called latency):