How is disk speed measured? Is it Mbit or Mbyte per second read? What is average today and what is fast and what is very fast in the industry?
Let's say somebody says it takes a long time to make a copy of a file of 1500 GB (say a database file), how long would that take on a professional system and how can that be calculated taking the speed of the hard disk into acount?
Best Answer
Disk speeds are usually measured in;
As you can see there is no real average, if you'd like recommendations on what to buy please feel free to come back to us with as much information as you can - this should include budget, application type, data set size, user base, hardware/OS plus anything else you think would be useful.
As for your 1.5TB copy, well if you were doing this to a USB 2-attached 7200rpm SATA disk you should get at least 30MBps-40MBps or so the full 1.5TB could take over 10 hours or so. If this were a typical professional DAS/SAN system I'd expect in the region of 100MBps meaning it'd take around 3 hours.
Hope this helps, oh and just to clarify, MB=megabytes, Mb is megabits.