DigiDesign HD MADI Guide de l'utilisateur télécharger pdf (Page 78)

Pro Tools|HD User Guide72

Partitioning Drives

Partitioning creates a logical volume or volumes

on a physical drive, almost as if you were creat-

ing virtual hard drives. Partitions can then be

formatted with the appropriate file system

(NTFS for Windows, HFS+ for Mac).

Seek Times on Partitioned Drives

Seek times are actually faster on partitioned

drives (assuming that reads and writes are per-

formed on a single partition), since the heads

only have to seek within the partition boundar-

ies, rather than the whole capacity of the drive.

Smaller partitions perform faster than larger par-

titions, but this comes at the expense of contig-

uous storage space. When you partition a drive,

you will need to find the compromise that best

suits your performance and storage require-

ments.

Defragmenting an Audio Drive

Mac Systems

When working with larger files (such as video),

you can limit fragmentation by backing up your

important files to another disk, erasing the files

from the original hard disk, then copying the

files back, instead of doing a defragmentation.

Windows Systems

Periodically defragment audio drives to maintain

system performance.

For maximum recording and playback effi-

ciency, data should be written to your hard

drive in a contiguous fashion—minimizing the

seek requirements to play back the data. Unfor-

tunately, your computer can’t always store the

sound files in this way and must write to disk

wherever it can find space.

In multitrack recording, audio tracks are written

in discrete files, spaced evenly across the disk.

While fragmentation of individual files may be

zero, the tracks may be far enough apart that

playback will still be very seek-intensive. Also,

the remaining free space on the disk will be dis-

contiguous, increasing the likelihood of file

fragmentation on subsequent record passes.

Increased fragmentation increases the chance of

disk errors, which can interfere with playback of

audio, and result in performance errors.

The NTFS file system allows drives to be

seen as whole volumes. Single Pro Tools au-

dio files cannot exceed 3.4 GB in size.

Mac OS allows drives larger than 4096 MB

to be seen as whole volumes. Drives must be

initialized with a disk utility that recog-

nizes the 2 terabyte limit. Single Pro Tools

audio files cannot exceed 3.4 GB in size.

Avoid distributing audio files within a ses-

sion over different partitions on the same

drive since this will adversely affect drive

performance.

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