IBM TS4500, Введение и руководство по планированию

Страница: 17 / 218

Table 1. Authorized suppliers of custom bar code labels (continued)
In the Americas In Europe and Asia
Netc, L.L.C. 1
100 Corporate Drive
Trumbull, CT 06611
U.S.A.
Telephone: 203-372-6382
Fax: 203-372-0676
http://www.NetcLabels.com
Netc Europe Ltd 1
The Old Surgery
5a The Pavement
North Curry TA3 6LX
Somerset
U.K.
Telephone: 44 (0) 1823 491439
Fax: 44 (0)1823 491373
http://www.NetcLabels.co.uk
Netc Asia Pacific Pty Ltd 1
PO Box 872
Cooroy QLD 4563
Australia
Telephone: 61 (0) 7 5442 6263
Fax: 61 (0) 7 5442 6522
http://www.NetcLabels.com.au
Note:
1. This is an authorized supplier for radio frequency identification (RFID) labels.
Data storage values
TS4500 tape library documentation displays data storage values that have both
decimal (base-10) prefixes and binary (base-2) units of measurement.
Decimal units such as K, MB, GB, and TB are commonly used to express data
storage values. Although, these values are more accurately expressed with binary
units such as KiB, MiB, GiB, and TiB. At the K level, the difference between
decimal and binary units of measurement is relatively small (2.4%). This difference
grows as data storage values increase, and when values reach TB levels the
difference between decimal and binary units approaches 10%.
To reduce the possibility of confusion, the TS4500 tape library documentation
shows both decimal and binary units for data storage. Data storage values are
displayed with the following format:
#### decimal unit (binary unit)
By this example, the value 512 terabytes is displayed as:
512 TB (465.6 TiB)
Table 2 compares the names, symbols, and values of the binary and decimal units.
Table 3 on page xviii shows the increasing percentage of difference between binary
and decimal units.
Table 2. Comparison of binary and decimal units and values
Decimal Binary
Name Symbol Value
(base-10)
Name Symbol Value (base-2)
kilo K 10 3 kibi Ki 2 10
mega M 10 6 mebi Mi 2 20
giga G 10 9 gibi Gi 2 30
Publication description
xvii