User manual FREECOM AIT-SDX470

[. . . ] SDX-470V/P SDX-470V/RP 5. 25 Model Product Specification Manual Version 1. 0 Aug. 2005 Copyright © 2005, Sony Corporation. NOTE: This Product Specification Manual is applicable for AIT-1 Turbo Serial ATA I/F drive. 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. [. . . ] A Data Decompression Enable (DDE) bit of one indicates that data decompression is to be enabled. A DDE of zero indicates that data decompression is disabled. The Report Exception on Decompression (RED) field indicates the Device's response to certain boundaries it detects in the data on the medium. There are a number of boundaries that may occur on the medium between compressed and uncompressed data. RED: The Report Exception on Decompression (RED) field indicates the device's response to a boundary condition caused by a change in the format of recorded data from: uncompressed to compressed or compressed to uncompressed This field only has an effect during reading not during writing. This field is not supported and should be always set to 00b. RED Value 00b Description The SDX-470V will return a CHECK CONDITION status (MEDIUM ERROR) whenever data is encountered on the media that the drive cannot decompress. The SDX-470V will not return a CHECK CONDITION status at a boundary condition as long as the data is uncompressed or ALDC1 compressed. The drive shall return a CHECK CONDITION status whenever a boundary condition is encountered on the medium. The boundary conditions are from: uncompressed to compressed or compressed to uncompressed CHECK CONDITION will be reported on the boundary condition even if the drive supports hardware decompression. For any of the boundary conditions which result in a CHECK CONDITION status, the additional sense code shall be set to either DECOMPRESSION EXCEPTION, ALGORITHM ID OF NN. The drive will set the decompression algorithm field to the algorithm identifier of the compression algorithm used to process the encountered data. The device shall be positioned on the EOP side of the encountered data, and the command-specific information field in the sense data shall contain a count of the number of data blocks contained within the encountered data. Note: When compressed data is encountered on the medium which the device cannot decompress, the device should treat the data as a single variable-length record. In the sense data, the valid bit, the ILI bit and the information field should be set accordingly. A RED field of 11b is undefined. 01b 10b 11b Compression Algorithm: The compression algorithm field indicates the compression algorithm the drive will use to process data sent to it by the initiator (if the DCE bit is one). The SDX-470V supports the ALDC1 data compression algorithm which is identified by the value: 00 00 00 03h in the compression algorithm field. A value of ZERO shall indicate that no compression algorithm is currently selected. Any other values in this field will cause the drive to return a CHECK CONDITION status the sense key shall be set to ILLEGAL REQUEST. Decompression Algorithm: For MODE SELECT the decompression algorithm field indicates the decompression algorithm selected by the initiator for use in subsequent decompression of data encountered on the medium. The SDX-470V can decompress data recorded with the ALDC1 algorithm therefore this field can be set to 00 00 00 03h. However, the SDX-470V is capable of automatic recognition of the compression algorithm used to process the data encountered on the medium. Therefore, the drive will override the value in the decompression field (if is set to ZERO) for a subsequent read operation when ALDC1 compressed data is detected on the media. SONY AIT-1 Turbo drive SDX-470V series Ver. 1. 0 7-35 7. [. . . ] The Accumulative System Log in MIC is saved, even if the cassette is re-initialized. MIC cassettes may be re-initialized in either the DDS mode or the AIT mode. The drive treats MIC cassettes with unreadable MIC as non-MIC media. SONY AIT-1 Turbo drive SDX-470V series Ver. 1. 0 16-1 16. LOADING/UNLOADING The AIT cassette; 3 partitioned, Ejected cassette. [. . . ]