Alsoft DiskWarrior - 2.0 Manual De Instruções

Página de 92
 
Welcome to DiskWarrior
 
 
Chapter 1: Introduction
9
 
blocks and alternate master directory blocks (HFS), volume headers and alternate volume head-
ers (HFS Plus), volume bit maps, catalog trees, and extents trees.
This approach has a significant advantage that the others overlook. Other products attempt to 
repair your directory one step at a time, ignoring the big picture of what is truly wrong with your 
directory, and risking file information that could be saved. Too often, they will incorrectly begin 
to “repair” your directory, and then give up when they realize that they have modified the direc-
tory to an irreparable state. At Alsoft, we know that the most important thing when you are at-
tempting to repair your disks is getting your data back. That's why the first thing DiskWarrior 
checks is your directory data, and that’s what it uses to create a replacement directory. Disk-
Warrior continues its rebuild operations unless no directory data can be found.
 
What is the Directory?
 
The directory is an area of a disk used by the Mac OS to “map” all the information stored on the 
disk. Some of what is stored in the directory is the numbers, names, locations, types, and sizes 
of files and folders saved on the disk. When any software wants information from a disk, the Mac 
OS must go to the directory to find out where the information is located. Also, when any software 
wants to save information to a disk, the Mac OS must go to the directory to find out where the 
information can be placed. All the necessary information about where the data was saved is then 
recorded in the directory.
The directory consists of two parts, the structure and the data. The directory data is the informa-
tion such as the numbers, names, locations, and sizes of files and folders saved on the disk. The 
directory structure is the organization of this data in the directory (the directory structure is not 
the folder organization you see on your disk, nor is it organized as such). The Mac OS uses the 
structure to quickly access the data and thus find out where in the directory the data is located. 
This structure can be thought of as analogous to a telephone directory, where the data are the 
names and phone numbers, and the structure can vary depending upon which method for find-
ing the data is more convenient. The names and numbers can be organized alphabetically or can 
be organized by category (automotive, computers, physicians, etc.).
 
What Is Directory Damage and How Does It Affect Me?
 
When any of the information about the numbers, names, locations or sizes of files and folders in 
a directory (the directory data) or the structure of the directory is either incorrectly updated or 
not updated at all, that directory is considered damaged. This damage is normally limited to only 
a specific area of the directory. So, it’s quite common for directory damage to remain undetected