Owner`s manual

About AMOS Page 5-7
Eagle 250 Owner's Manual, Revision 01
This diagram shows how a disk drive is divided into logical devices, projects, account, and files:
Physical Disk
DSK0:
DSK1:
DSK2:
DSK3:
DSK4:
DSK5:
DSK6:
Logical
Disks
Logical Disk
[1,*]
[2,*]
[3,*]
[4,*]
[5,*]
[6,*]
[7,*]
[10,*]
etc .
Projects
Project
[3,0]
[3,1]
[3,2]
etc.
Accounts
Account
Files
START.CMD
DATA.DAT
DOCUM.TXT
etc.
Figure 5-1: Disk Data Layout
This diagram is just a way to show how AMOS logically divides the disk. Data is not physically arranged
on the disk this way: for example, the data in one file may be in several locations, and all of the files in
an account are not necessarily in the same area of the drive. The actual physical location of the data on
the disk is not important to you; AMOS uses the logical device specification to find the physical data.
Organizing the Disk
Theoretically, you could store all your files in the same disk account. A list of the files—the system
software, your special application programs, memos, everything—would be many pages long and a
nightmare to decipher.
As discussed earlier, a better way is to organize your files by using separate accounts and projects, each
of which stores related files. Your system software is already organized into various accounts, and you
can add as many or as few additional ones as you need. For example, you could create a project to store
all files related to correspondence, with letters to vendors in one account, faxes in another, and so on.
As mentioned above, the same account number can exist on more than one disk device. Since the devices
are different, the accounts are different, though they have the same number. Because there is the danger
of logging into the wrong account in this situation, you may want to establish a numbering scheme to
prevent duplicates. You could reserve accounts [1,*] through [77,*] for DSK0:, accounts [101,*] through
[200,*] for DSK1:, and so on.
You can assign an ersatz name to any account. An ersatz name stands for a particular account:
you can refer to the account using either its number or the ersatz name, which is generally easier
to remember. For example, the DSK0:[1,2] account has the ersatz name OPR:. To log to this
account, you can type either LOG DSK0:[1,2]
ENTER
or
LOG OPR:
ENTER
.The file
DSK0:ERSATZ.INI[1,4] contains several predefined ersatz names, and you can add more. The
AMOS System Operator's Guide contains more information on how to add and use ersatz names.