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. MaxFaxTM is a trademark of 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. [. . . ] Before the Set Multiple Mode command has been executed, or 2. When Read Multiple commands are disabled. The controller reports disk errors encountered during Read Multiple commands at the start of the block or partial block transfer. However, DRQ still sets, and the transfer occurs normally, along with the transfer of any corrupt data. 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. The drives support block sizes of 2, 4, 8 and 16 sectors. 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. After the host fills the buffer, DRQ is reset and BSY is set. If an error occurs, Write Sector operations terminate at the sector containing the error. [. . . ] RAM is used for permanent information storage. Computer control programs are often stored in ROM applications. SERVOSYSTEM An automatic system for maintaining the read/write head on track; can be either "open loop, " "quasi-closed loop, " or "closed loop. " READ/WRITEHEAD The recording element which writes data to the magnetic media and reads recorded data from the media. SERVOTRACK A track on a servo surface. The prerecorded reference track on the dedicated servo surface of a disk drive. All data track positions are compared to their corresponding servo track to determine "off track"/"on track" position. RE-CALIBRATE The action of moving the head of a disk drive to cylinder zero. RECOVERABLEERROR A read error, transient or otherwise, falling within the capability of an ECC mechanism to correct, or able to overcome by rereading the data in question. SETTLING TIME The time it takes a head to stop vibrating, within specified limits, after it reaches the desired cylinder. SILICON Semiconductor material generally used to manufacture microprocessors and other integrated circuit chips. ROTATIONALLATENCY The amount of delay in obtaining information from a disk drive attributable to the rotation of the disk. SMALL COMPUTER SYSTEM INTERFACE (SCSI) An intelligent interface that incorporates controller functions directly into the drive. RUN-LENGTH LIMITED An encoding process that repositions data bits and limits the length of zero bits in order to compress information being stored on disks. S. M. A. R. T. [. . . ]