User manual HP STORAGEWORKS DAT 24 USB TAPE DRIVE

[. . . ] HP StorageWorks DAT USB Tape Drives user guide Part number: Q1580­90905 Second edition: February 2007 Legal and notice information © Copyright 2005, 2007 Hewlett-Packard Development Company, L. P. The information contained herein is subject to change without notice. The only warranties for HP products and services are set forth in the express warranty statements accompanying such products and services. Nothing herein should be construed as constituting an additional warranty. [. . . ] HP StorageWorks DAT 160 tape drives: The Ready light flashes green while the drive performs its load sequence. When the cartridge is loaded, the Ready light shows steady green. HP StorageWorks DAT 72, DAT 40 and DAT 24 tape drives: The Tape light flashes green while the drive performs its load sequence. When the cartridge is loaded, the Tape light shows steady green. DAT USB Tape Drives 39 Removing cartridges CAUTION: Never try to remove a cartridge before it is fully ejected. Press the Eject button on the front panel. 1. eject button Figure 18 Ejecting a DAT 160 cartridge from an HP StorageWorks DAT 160 external drive 2. The drive completes any task it is currently performing, winds the tape to the beginning, and ejects the cartridge. The sequence will take about 25 seconds for a write-enabled cartridge and 10 seconds for a write-protected cartridge. Removing power from the drive To ensure reliable operation, do not remove power from the drive during read, write, fast-search, load and unload activities. 40 Operating your tape drive 7 Use the correct media For best performance we recommend HP branded media. Order online at: http://www. hp. com/go/ storagemedia. If you do not have internet access, refer to the User's Guide on the HP StorageWorks Tape CD-ROM for ordering information for tape cartridges and cleaning cartridges. Data cartridges HP StorageWorks DAT 160 tape drives and HP DAT 160 cartridges HP DAT 160 cartridges (C8011A) can only be used with HP StorageWorks DAT 160 tape drives; they are wider than earlier formats and will not fit into earlier tape drive models. DAT 160 cartridges provide optimum performance and maximum capacity for HP StorageWorks DAT 160 tape drives. DAT 160 tape drives are also backwards compatible with some earlier formats, see Table 4 on page 41. Compatibility For optimum performance and storage capacity, use tape cartridges that match your drive's format, and normally use only one cartridge per day. Ideally, use: · · · · HP's HP's HP's HP's DAT 160 cartridges with DAT 160 tape drives DAT 72 cartridges with DAT 72 tape drives DDS-4 cartridges with DAT 40 tape drives DDS-3 and DDS-2 cartridges with DAT 24 tape drives Although HP StorageWorks DAT tape drives are fully backward compatible, old tape formats are more abrasive than later generations and using older tape formats can reduce the life expectancy of the tape drive. The compatibility between drive models and cartridges is summarized in Table 4 on page 41. Shaded boxes show the recommended media for each tape drive. Capacities assume a compression ration of 2:1. Table 4 Data cartridge compatibility DDS-2 120 meter HP StorageWorks DAT 160 HP StorageWorks DAT 72 HP StorageWorks DAT 40 HP StorageWorks DAT 24 not supported not supported read/write 8 GB* C5707A DDS-3 125 meter not supported read/write read/write 24 GB* C5708A DDS-4 150 meter read/write read/write 40 GB* C5718A not supported DAT 72 170 meter read/write 72 GB* C8010A not supported not supported DAT 160 170 meter 160 GB* C8011A not supported not supported not supported * Capacity assumes 2:1 compression. NOTE: DDS-1 cartridges are not supported on any HP StorageWorks DAT drive. DAT USB Tape Drives 41 Write-protecting cartridges If you want to protect the data on a cartridge from being altered or overwritten, you can write-protect the cartridge. Always remove the cartridge from the tape drive before you change the write protection. · To write-protect a cartridge, slide the tab on the rear of the cartridge so that the recognition hole is open. · To write-enable a cartridge, slide the tab back so that the hole is closed. Write-protection will not protect your cartridges against magnets (or bulk erasers). 1. tab open, cartridge write-protected Figure 19 Write protecting a cartridge Cleaning cartridges HP recommends weekly cleaning of the tape drive using an HP cleaning cartridge. [. . . ] But how fast or often the data is transmitted is not as important as the accuracy of the data. The host will give network bandwidth priority to periodic devices and will share any remaining bandwidth equally among any active bulk transfer devices. USB supports many types of devices and three data transfer rates, low speed, full speed, and high speed. (A keyboard does not need to transfer data to the system at the same speed as a cable modem. ) The transfer speed capabilities of a device are often referred to by the USB specification revision in which the transfer rate was defined. [. . . ]