Alsoft DiskWarrior - 4.0 Instrukcja Obsługi Pobierz pdf (Strona 14)

Basic Terms You Need To Know

Chapter 1: Introduction 14

Basic Terms You Need To Know

This section explains some terms and concepts used throughout this manual.

Application

An application is a tool your computer uses to manipulate information and perform a

useful function for you. Applications include such products as AppleWorks, iTunes, or

Mail.

Block

The physical surface of a disk is comprised of many 512 byte storage areas called

physical blocks. The larger the disk, the greater the number of physical blocks on the

disk. An allocation block is a group of one or more physical blocks treated as a single

storage area by the Mac OS. The older Mac OS Standard format, or HFS, can only keep

track of 65,535 allocation blocks per disk. Therefore, the larger the size of a disk, the

greater the number of physical blocks in each allocation block, so that the total

number of storage areas on the disk does not exceed the maximum of 65,535. The

newer Mac OS Extended format, or HFS Plus, can keep track of over 4 billion allocation

blocks per disk. HFS Plus uses allocation blocks sizes ranging from 0.5 KB to 4 KB. The

Macintosh ﬁling system stores ﬁles by breaking them into allocation block-size pieces

and writing them into unused allocation blocks wherever they are available.

Damaged Items Folder

When DiskWarrior performs its directory rebuild function, it may recover ﬁles that

potentially have problems due to directory damage that existed before the application

was run. If such ﬁles are recovered, DiskWarrior will create a Damaged Items folder

for these ﬁles.

Directory

The directory of a disk is a group of allocation blocks set aside by the Mac OS to store

the number, name, location (which allocation blocks), and size of each ﬁle and folder

stored on the volume.

Directory Data

The directory data includes the information about the numbers, names, locations,

types, and sizes of ﬁles and folders saved on the disk.

Directory Structure

The directory structure is how the directory data is organized within the directory. The

Mac OS uses the directory structure to quickly access the directory data. Its structure

is an indexed database, similar to that used by the Finder in the Desktop database, as

well as by FileMaker with its databases.

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Alsoft DiskWarrior - 4.0 Instrukcja Obsługi Strona 14