User manual MAXTOR DIAMONDMAX PLUS 40

[. . . ] DiamondMax Plus 40 54098U8, 53073U6, 52049U4, 51536U3, 51024U2 ® Part #1429/A All material contained herein Copyright © 2000 Maxtor Corporation. DiamondMax ®, Maxtor ® and No Quibble ® Service are registered trademarks of Maxtor Corporation. Other brands or products are trademarks or registered trademarks of their respective holders. All rights reserved. Corporate Headquarters 510 Cottonwood Drive Milpitas, California 95035 Tel: 408-432-1700 Fax: 408-432-4510 Research and Development Center 2190 Miller Drive Longmont, Colorado 80501 Tel: 303-651-6000 Fax: 303-678-2165 You Before You Begin Thank you for your interest in the Maxtor DiamondMax® Plus 40 AT hard disk drives. [. . . ] Remaining block data from the following the sector in error is not valid. If the Sector Count register contains 0 when the Set Multiple Mode command is issued, Read Multiple and Write Multiple commands are disabled; no error is returned. Once the appropriate action has been taken, the controller resets BSY and generates an interrupt. At power up, or after a hardware or software reset, Read Multiple and Write Multiple commands are disabled by default. 7­3 INTERFACE COMMANDS Set Multiple Mode Enables the controller to perform Read and Write Multiple operations, and establishes the block count for these commands. Before issuing this command, the Sector Count register should be loaded with the number of sectors per block. When this command is received, the controller sets BSY and examines the Sector Count register contents. If they contain a valid and supported block count value, that value is loaded for all subsequent Read and Write Multiple commands, and execution of those commands is enabled. An invalid and unsupported block count in the register results in an Aborted Command error and disallows Read Multiple and Write Multiple commands. Write Commands Write Sector(s) Writes from 1 to 256 sectors, beginning at a sector specified in the Command Block. (A sector count of 0 requests 256 sectors. ) When the Command register is written, the drive sets the DRQ bit and waits for the host to fill the sector buffer with the data to be written. An interrupt is not generated to start the first buffer fill operation. Once the buffer is full, the drive resets DRQ, sets BSY, and begins command execution. If the drive is not already on the desired track, an implied seek is performed. The data loaded in the buffer is written to the data field of the sector, followed by the ECC bytes. Upon command completion, the Command Block registers contain the cylinder, head and sector number of the last sector written. The next time the buffer is ready to be filled during back-to-back Write Sector commands, DRQ is set and an interrupt is generated. If an error occurs, Write Sector operations terminate at the sector containing the error. The Command Block registers then contain the numbers of the cylinder, head and sector where the error occurred. The host may read the Command Block to determine the nature of that error, and on which sector it happened. A Write Long may be executed by setting the Long bit in the command code. The Write Long command writes the data and the ECC bytes directly from the sector buffer; the drive itself does not generate the ECC bytes. Restrict Write Long commands to PIO Mode 0. Write Verify Sector(s) Identical to the Write Sector(s) command, except that the requested sectors are verified immediately after being written. The verify operation reads (without transferring), and checks for data errors. [. . . ] Also known as transition detect. SEQUENTIALACCESS The writing or reading of data in a sequential order such as reading data blocks stored one after the other on magnetic tape. This is contrasted to random access of information. R RANDOMACCESSMEMORY(RAM) Memory designed so that any storage location can be accessed randomly, directly and individually. This is contrasted to sequential access devices such as tape drives. SERVOBURST A momentary servo pattern used in embedded servo control systems usually positioned between sectors or at the end of a track. SERVOCONTROL A technique by which the speed or position of a moving device is forced into conformity with a desired or standard speed or position. READ To access a storage location and obtain previously recorded data. Usually implemented such that a dynamic flux amplitude will cause a proportional electrical output from the transducer. SERVOHEAD A magnetic head designed specifically for accurately reading servo data. SERVO PATTERN A readback signal that indicates the position of a head relative to a track. READGATESIGNAL A digital input signal which causes the drive circuitry to recover data. SERVOSURFACE A recording surface in a multi-surface disk drive that only contains control information which provides timing, head position, and trackfollowing information for the data surfaces. READ ONLY MEMORY (ROM) A form of memory which cannot be changed in formal operational modes. [. . . ]