that is exchanged or stored during synchronization
During synchronization, Windows Media Player copies
the content in the categories and playlists that you selected
to your device. In addition, The Player and your
device exchange some or all of the following information in order
to complete the synchronization process:
Device information. Because the Player can keep track of
up to 16 devices on one computer, it stores information about all
devices that it has synchronization partnerships with. It also stores information
about the content in your library that has been
synchronized to each device. If you create a partnership that
requires the Player and a device to automatically synchronize
content when you connect your device to your computer, the Player
can quickly determine the connected device and the content in your
library that must be synchronized, greatly improving performance.
For some devices, the Player also places a file named
WMPInfo.xml on the device to track the partnership. Deleting the
file, if it exists, will cause the Player to lose its partnership
information with the device. Some devices do not require this file
to be created.
Device capabilities. When you connect your device to
your computer, the Player inspects the device to determine its
playback and storage capabilities. For example, the Player
determines if the device can play audio and/or video files and the
associated file formats, codecs, and bit
rates that the device supports. The Player turns off
options for synchronizing certain file types in the selected
categories and playlists if it determines that the device cannot
play the files.
The Player also determines the amount of space on the
device that is available for storing synchronized files and whether
the device can support storage of files in folders.
For mass storage class devices, the Player can only
determine the available disk space on the device and only
synchronizes music files to the device by default. To synchronize
other file types to mass storage class devices, you
will need to update partnership settings.
Media information. The Player can synchronize media information for music files, such as
album information and album art, if the device can display the
information. If album art contains a link to purchase the album
online and your device allows you to click the link, the next time
you connect your device to your computer, your Internet browser
will open a Web page that allows you to complete the
Licenses. A content
provider may specify certain rights in the license for a protected file, such as the
number of times you can play the file or an expiration date. To
maintain these rights, the license associated with a protected file
is synchronized along with the file.
Play count. The Player and your device may exchange
information about the number of times a synchronized file was
played, both in the Player and on the device. The new total play
count is updated in your library and on your device during
synchronization. The auto playlists you created in your library
that have criteria based upon play count can then be updated
appropriately. Your auto-ratings, which change based upon the
number of times an item is played, are updated appropriately.
Time. The Player and your device may exchange
information about whether a synchronized file was played on the
device. The Player then creates a new time for when the files was
last played, so that the auto playlists you created in your library
that have criteria based upon the time when files are played are
Ratings. Ratings information for synchronized files can
be updated in your library if you changed the rating for the file
on the device. Your device must support the ability to change file
ratings. The auto playlists you created in your library that have
criteria based upon ratings that you assign to files are updated
You can tell a device is a mass storage class
device if Windows XP assigns a drive letter to the device when
you connect it to your computer.
A content provider may set an expiration date
for a licensed file. If your device does not have the hardware
required to monitor expiration, The Player may not be able to
synchronize these files to your device.
A content provider may require that your device
have a hardware serial number in order to play a licensed file. The
Player may not be able to synchronize files from the content
provider, or you may not be able to play synchronized files on the
device, if it does not have a hardware serial number.
If your device appears as a "Fixed Disk" in My
Computer, the Player cannot synchronize content to the device.
Contact the device manufacturer directly for support.