Corrections to Exabyte Eliant 820 Product Specification (316593-002) Chapter 4, page 1-13 The text in paragraph 2: "All EXATAPE 160m XL data cartridges contain a Recognition System (RS) stripe located on the tape leader for media identification. The Eliant 820 uses this stripe to distinguish data-quality metal-particle media, such as EXATAPE, from other 160m media. The Eliant 820 automatically ejects 160m data cartridges or equivalent length video cartridges that are not equipped with the Recognition System stripe. By rejecting potentially inferior media, the tape drive ensures greater data reliability and protects the read and write heads from unnecessary wear." should be changed to: "All EXATAPE 160m XL data cartridges contain a Recognition System (RS) stripe located on the tape leader for media identification. The Eliant 820 uses this stripe to distinguish data-quality metal-particle media, such as EXATAPE, from other 160m media. If you attempt to use a 160m data cartridge or equivalent length video cartridge that does not include the Recognition System stripe, the Eliant 820 sizes the tape as a 112m tape." Chapter 6, page 6-3 The text under "High Speed Search Rates": "High-speed search occurs when the initiator issues a LOCATE command (for tapes written in 8500 or 8500c formats) or a SPACE command. Table 6-4 shows the rates at which the tape drive performs high-speed searches. Table 6-4: High-speed search rates" should be changed to: "High-speed search occurs when the initiator issues a LOCATE command (for tape written in 8500 or 8500c formats), a SPACE command, or a REWIND command. Table 6-4 shows the maximum rates at which the tape drive performs high-speed searches. The search speeds do not include time spent in command overhead or in accelerating and de-accelerating the tape. Table 6-4: Maximum High-speed search rates" Chapter 6, pages 6-3 and 6-4 The text under "Write and Read Access Times": "Write access time starts when the tape drive receives the last byte of the WRITE command (that is, when the initiator de-asserts ACK) and ends when the tape drive asserts REQ to request that the initiator transfer the first data byte across the SCSI bus. Read access time starts when the tape drive receives the last byte of the READ command (that is, when the initiator de-asserts ACK) and ends when the tape drive asserts REQ to indicate that it is ready to transfer the first data byte across the SCSI bus to the initiator. Write and read access times depend on whether the tape drive is operating in start/stop mode or streaming mode (see page 3-5)." should be changed to: "The write and read access times are measurements of the total time required to initiate a data transfer to or from the tape drive. Access time begins when the initiator de-asserts the last ACK of the Command phase to complete the transfer of the last byte of the WRITE or READ command. Access time ends when the tape drive asserts the first REQ during the subsequent Data phase to indicate it is ready to receive or transfer data. The time spent in all intervening phases is included as part of the access time. If the tape drive disconnects to fill the buffer on a read, to empty the buffer on a write, or to perform error recovery, the time it is disconnected is not included in the access time. If the tape drive disconnects between the Command and Data phase for any other reason, the time it is disconnected is included in the access time. The start/stop write and read access times apply when the tape is not in motion and the tape drive is not positioned at the beginning of a partition. The first WRITE or READ command after the tape drive switches between write and read operations does not count as part of the average access time. The streaming write and read access times apply to variable-clock mode commands processed while the tape drive is steadily streaming data. Table 6-5 shows the typical write and read access times for the tape drive." Chapter 6, Table 6-5 The value for the typical read access time for streaming: "3.2 msec." should be changed to: "3.7 msec." (The note under the table should also be removed.) Chapter 6, page 6-4 The text under Reposition Time: "Reposition time starts when the initiator issues a command that stops the tape drive’s motion control system and ends when the tape is repositioned, at nominal speed, so that the next byte of data can be transferred. Reposition time is independent of any interface delays. Reposition time for the tape drive ranges from 1.2 sec to 1.5 sec." should be changed to: "When operating in start/stop mode, the tape drive must reposition during read and write operations because the host does not transfer data fast enough to keep the tape drive streaming. During a read operation, reposition time is the time the tape drive take to stop the tape when the buffer is filled, back up and reposition the tape, and start filling the buffer again when it is emptied to the motion threshold (see page 3-6). The time required for the host to empty the buffer to the motion threshold is not included in the reposition time. During a write operation, reposition time is the time the tape drive takes to stop the tape when the buffer is emptied, back up and reposition the tape, and start emptying the buffer again when it is filled to the motion threshold. The time required for the host to fill the buffer to the motion threshold is not included in the reposition time. The minimum reposition time for the tape drive is 630 msec." Chapter 6, Table 6-6 The value for 54m tape rewind time: "75 sec." should be changed to: "90 sec." Home | News & Info | Products | Customer Care | Support Services | Government | Search | Partner Central | Contact | Site Index © Copyright 2000 Exabyte Corporation, 1685 38th Street, Boulder, Colorado 80301, U.S.A., All rights reserved.