Hitachi 88-06-0x - Conventions for Storage Capacity Values

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Conventions for storage capacity values
Physical storage capacity values (for example, disk drive capacity) are calculated based
on the following values:
Physical capacity unit Value
1 kilobyte (KB) 1,000 (10
3
) bytes
1 megabyte (MB) 1,000 KB or 1,000
2
bytes
1 gigabyte (GB) 1,000 MB or 1,000
3
bytes
1 terabyte (TB) 1,000 GB or 1,000
4
bytes
1 petabyte (PB) 1,000 TB or 1,000
5
bytes
1 exabyte (EB) 1,000 PB or 1,000
6
bytes
Logical capacity values (for example, logical device capacity, cache memory capacity) are
calculated based on the following values:
Logical capacity unit Value
1 block 512 bytes
1 cylinder Mainframe: 870 KB
Open-systems:
■
OPEN-V: 960 KB
■
Others: 720 KB
1 KB 1,024 (2
10
) bytes
Conventions for storage capacity values
Preface
Hitachi Virtual Storage Platform G900 Hardware Reference Guide 10