User guide

x Preface
Hitachi Unified Storage VM Block Module Hardware User Guide
Hitachi Data Systems user manuals use the following icons to draw
attention to information.
Convention for storage capacity values
Physical and logical storage capacities of disk drives in Hitachi Data Systems
storage products are calculated based on the following values:
Logical storage capacity values (logical device capacity) are calculated
based on the following values:
| vertical bar Indicates that you have a choice between two or more options
or arguments. Examples:
[ a | b ] indicates that you can choose a, b, or nothing.
{ a | b } indicates that you must choose either a or b.
Convention Description
Icon Meaning Description
Tip Helpful information, guidelines, or suggestions for
performing tasks more effectively.
Note Information that is important or essential to the completion
of a task.
Caution Failure to take a specified action can result in adverse
conditions or consequences such as damage to the software
or hardware
WARNING Failure to take a specified action can result in severe
conditions or consequences such as in loss of data or serious
damage to hardware.
ELECTRIC
SHOCK
HAZARD
Failure to take appropriate precautions such as not opening
or touching hazardous areas of the equipment could result in
injury or death.
Physical Disk Capacity
1 KB = 1,000 bytes
1 TB = 1,000
4
bytes
1 MB = 1,000
2
bytes 1 PB = 1,000
5
bytes
1 GB = 1,0003 bytes
1 EB = 1,000
6
bytes
Logical Disk Capacity (1 block= 512 bytes)
1 KB (kilobyte) = 1,024 bytes (2
10
) 1 TB (terabyte) = 1,024
4
bytes
1 MB (megabyte) = 1,024
2
bytes 1 PB (petabyte) = 1,024
5
bytes
1 GB (gigabyte) = 1,024
3
bytes 1 EB (exabyte) = 1,024
6
bytes