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If the CD device supports it, you can enable the digital CD playback feature in the drive s Properties dialog box in Device Manager. On the Properties tab, select the Enable Digital CD Audio For This CD-ROM Device check box. Digital CD playback requires that CD devices support digital audio extraction (DAE), which older devices might not support. When digital CD playback is enabled, the CD-ROM drive does not have to be connected to the sound card, and audio output from the headphone jack on the CD-ROM drive is disabled.

Session session = sessionFactory.openSession(); Transaction tx = session.beginTransaction(); // Update three old Category instances and insert the new one session.saveOrUpdate(laptops); tx.commit(); session.close();

Removable storage media consist of devices such as disks, tape, and optical media, which are stored either online in the form of information libraries or offline on a shelf or in a file drawer. These media are used primarily for backup of applications and data. They are also used to archive data that is not accessed frequently. Previous versions of Windows (pre Windows 2000) did not provide strong support for removable devices. Each application that required access to a removable device needed a custom solution for accessing and managing removable storage media. Windows XP centralizes the management of these devices with Removable Storage technology. Removable Storage allows the operating system to manage removable media centrally, and applications gain access to removable devices through the Removable Storage interface. Devices with drivers that have been written to take advantage of Removable Storage are easily accessible and sharable by both the operating system and applications. Removable Storage uses the concept of media pools to organize removable media. Media pools group media by usage, allow media to be shared by multiple applications, control media access, and provide for tracking of media usage. Other concepts of removable storage include the following: Media units The actual devices that store information, such as a CD-ROM, tape cartridge, or removable disk.

Managing and Troubleshooting Disks and Volumes 10-25

Because you specify cascade="save-update" on the childCategories collection, Hibernate determines what is needed to persist the objects to the database. In this case, it queues three SQL UPDATE statements (for laptops, laptopUltraPortable, laptopTablePCs) and one INSERT (for laptopBags). The saveOrUpdate() method tells Hibernate to propagate the state of an instance to the database by creating a new database row if the instance is a new transient instance or updating the existing row if the instance is a detached instance. More experienced Hibernate users use saveOrUpdate() exclusively; it s much easier to let Hibernate decide what is new and what is old, especially in a more complex network of objects with mixed state. The only (not really serious) disadvantage of exclusive saveOrUpdate() is that it sometimes can t guess whether an instance is old or new without firing a SELECT at the database for example, when a class is mapped with a natural composite key and no version or timestamp property. How does Hibernate detect which instances are old and which are new A range of options is available. Hibernate assumes that an instance is an unsaved transient instance if:

Media libraries Encompass both online libraries and offline media physical locations. Online libraries, which include robotic libraries and stand-alone drives, are data-storage devices that provide a method of reading and writing to media when necessary. Offline media physical locations are holding places for media units that are cataloged by Removable Storage, but are not currently immediately available through an online library. Work queues Hold library requests until resources become available. For example, a robotic tape library has a fixed number of tape drives to access media. A request submitted to the library is held in a work queue until a tape drive becomes available and the requested tape is mounted. Operator (administrator) requests Hold requests for offline media. The operator must make the media available before processing can continue. Other situations that generate operator requests include the failure of a device or a device needing to be cleaned when no cleaner cartridge is available. After a request is satisfied, the administrator must inform Removable Storage so that processing can continue.