OS X Support Essentials 10.8 - Training - Apple

OS X Support Essentials 10.8 Exam Preparation Guide
7. How can you ensure that previously deleted items are
securely erased?
8. How can you encrypt a disk without erasing its contents?
9. What four methods can be used to eject a volume or disk
from the Finder?
10. What is the potential side effect of improperly unmounting or
ejecting a disk or volume?
Answers
1. Disks are the actual storage hardware; partitions are logical
divisions of a disk used to define the storage space; and
volumes, contained inside partitions, are used to define how
the individual files and folders are saved to the storage.
2. GUID Partition Table is the default partition scheme on Intelbased
Mac computers, and Apple Partition Map is the default
partition scheme on PowerPC-based Mac computers.
3. The two volume formats supported as system volumes for
OS X are Mac OS Extended (Journaled) and Mac OS Extended
(Journaled, Encrypted).
4. File system journaling records what file operations are in
progress at any given moment. This way, if a power failure or
system crash occurs, the system can quickly verify the
integrity of the volume by “replaying” the journal after restart.
5. The four erase options in Disk Utility are:
• Fastest, which simply replaces the volume’s directory
structure
• A second choice, which provides good security by writing
zeros on top of all the previous disk data
• A third choice, which provides even better security by
writing three separate passes of information on top of the
previous disk data
• Most Secure, which provides the best security by writing
seven separate passes of information on top of the
previous disk data
6. Secure Empty Trash performs a 7-pass erase on the contents
of the Trash folder.
7. From the Erase tab in Disk Utility, you can choose to securely
erase the free space of a disk or volume. This securely erases
any previously deleted files on the selected disk or volume.
8. From the Finder, you can encrypt a disk without erasing its
contents by right-clicking or Control-clicking the disk and
then choosing Encrypt from the shortcut menu.
9. The four methods used to eject a volume or disk from the
Finder are:
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