User manual FREECOM TAPEWARE AIT-250I

[. . . ] Notice This document contains proprietary information which is protected by copyright. No part of this document may be photocopied, reproduced or translated to another language without prior written consent of Sony. The information contained in this document is subject to change without notice. Sony shall not be liable for errors contained herein, or indirect, special, incidental or consequential damages in connection with the furnishing, performance, or use of this document. [. . . ] The size of partition 0 is only valid during Mode Sense and is ignored during Mode Select. For Mode Select only partition 1 size is used when Additional Partitions Defined field is set to 01h. Internally, the drive computes partition 0 size to be the remaining capacity of the tape. This remaining capacity is the maximum uncompressed capacity minus partition 1 size. A second way to issue Mode Select Page 11h is to set Page Length to 08h, and set bytes 8 and 9 to partition 1 size. In this method partition 0 size is not sent, but this size is still computed as defined above. In either case, Mode Sense will report partition 0 and partition 1 sizes. SONY AIT-E Turbo drive SDX-250V series Ver. 1. 0 6-35 6. Command Specification MODE SELECT 6. 7. 5. Medium Partitions Parameter Page (for multi-partitioned tapes) (11h) The Medium Partitions Parameter Page supported by the drive has the following format: Table 6-40: Medium Partitions Parameter Page(for multi-partitioned tapes) Bit Byte 0 1 2 3 4 5 6 7 8 9 10 11 PS (0) Reserved Page Code (11h) Page Length (08h - 88h) Maximum Additional Partitions Additional Partitions Defined IDP (1) PSUM (10b) Medium Format Recognition (03h) Reserved Reserved Partition Size (Partition 0) Partition Size (Partition 1) (LSB) : : : 134 135 (MSB) Partition Size (Physical & Logical Partition 63) (LSB) 7 6 5 4 3 2 1 0 FDP (0) SDP (0) Reserved (MSB) (MSB) (LSB) Warning: This page is used to format a tape to with one or two partitions. Extreme care must be used with this parameter page to avoid accidental reformatting of the tape. Maximum Additional Partitions: This field is only valid for MODE SENSE, and it is used to report the maximum number of additional partitions. This field is non-changeable; however it accepts all values as a don't care. The field value represents the maximum number of additional partitions supported, and it is limited by the free memory available in MIC, as well as the AIT Format limit of 256 partitions. SDX-250V calculates how many partitions can be created for the current SDX1-25C media; for example, you can make up to 14 partitions with net total 13 bytes of the User Volume Note and User Partition Notes when using 2Kbytes version of SDX1-25C. Additional Partitions Defined: This field specifies the number of additional partitions to be defined for the tape based on the IDP bit. The maximum allowed is the value returned in the Maximum Additional Partitions field. The drive the CHECK CONDITION status (ASC/ ASCQ = 83h/ 80h), when there is not enough room in the MIC. FDP: The Fixed Data Partitions bit is not supported by the drive and if set, a CHECK CONDITION status is returned with an ILLEGAL REQUEST Sense Key set. SDP: The Select Data Partitions bit is not supported by the drive and if set, a CHECK CONDITION status is returned with an ILLEGAL REQUEST Sense Key set. IDP: The Initiator Defined Partitions bit is supported and, when set to one, indicates that the tape shall be partitioned based on the Additional Partitions Defined field, PSUM and Partition Size field. The SDX-250V operating in the AIT Format Mode allows tapes to be split into separate and independent partitions, each with its own Reference, System and Vendor Group areas. A tape partitioned into several partitions may be considered a collection of several separate logical tapes. This is illustrated below: 6-36 SONY AIT-E Turbo drive SDX-250V series Ver. 1. 0 MODE SELSECT 6. Command Specification Single Partitioned Tape BOM BOT Partition 0 User Device System EOD Data Area Area Area EOP/ EOM EOT EOP/ EOM Two Partitioned Tape BOM BOT Partition 0 Partition 1 User User Device System EOD DEV System EOD Data Data Area Area Area Area Area EOT Three Partitioned Tape BOM BOT Partition 0 Partition 1 Partition 2 EOP/ EOM User User User Device System EOD DEV System EOD DEV System EOD Data Data Data Area Area Area Area Area Area Area EOT BOM = Beginning-of-Media (Physical) BOT = Beginning-of-Tape (Logical) EOM = End-of-Media (Physical) EOP = End-of-Partition (Logical) EOT = End-of-Tape (Logical) Figure 6-2: Tape Partition Layout A tape does not require partitioning prior to use. [. . . ] The host has limited access, and cannot perform any commands which would cause tape motion. The host can, however, load a tape, if one is inserted, and can execute any diagnostic tests which do not require tape motion. The host has access to all command operations, including those which access the tape, set configurations and run diagnostic tests. Over Length: The incorrect length condition that exists after executing a read command when the length of the actual block read exceeds the requested transfer length in the command descriptor block. [. . . ]