When users copy files to CDs with some special formats (but recognized by the Mac), which can create encontrarsr multiple files, some of which are invisible to some operating systems, but visible in others. For the most part, these files do not cause problems, but in some instances, may interfere with some functionality of the device or software.
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In the file systems Mac OS X these forks are treated as a file, and appear as such, however, the resource forks are not supported by many filesystems, including those used in Windows machines. As such, when users copy files to these systems, the resource fork can be lost. Therefore, Apple has built a system in OS X that automatically splits the file into resource and data when they are copied to disks that do not support resource forks.
In MP3 players with memory or disk formatted in FAT32 is usual to see some add both MP3 file data such as the Resource Fork, which implies that appear continuously during a random, for example, messages that the player can not read that file.
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The Apple system, divided into two parts,
Files. DS_Store
Besides the creation of fork files, OS X is known to fill the hard drives formatted with Windows files invisible, such as specific file folders placed in the trash and archives. DS_Store.
Prevent the creation of a manual file. DS_Store on network volumes
Mac users can avoid that. DS_Store create volumes on the network (or its internal folders), add the following command in Terminal:
defaults write com.apple.desktopservices true DSDontWriteNetworkStores
Unfortunately, this will only work if the command is carried out in all Macs accessing an external hard drive. Would be impractical to run this command on all Macs on a network, since it must be done "one to one." As such, it is better to run a utility on a regular basis to remove the hidden files.
Source and more: MacFixIt | www.faq-mac.com
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