If the drive enters NCQ mode and a non-queue command is received, the drive will respond with error to inform host a queue command been overlapped with non-queue. If a queue tag is not finished and another same tag command is received, the drive will response with error to inform host a duplicated tag is received.

Error information is reported according to the SATA II specification. A read Log Extended command with log page 10 is required to retrieve the error information.

8.2.15 Read Log Extended (2Fh)

This command returns the specified log to the host. The device shall interrupt for each DRQ block transferred. See ATA 7 document for command details.

8.2.16 Read Long (22h)

This command is obsolete in the ATA7 specification. The supporting of this command is for backward compatibility purpose. The use of this command is beyond the ATA standard and not recommended by the manufacture.

The Read Long command performs similarly to the Read Sectors command except that it returns the data and the ECC bytes appended to the data field of the desired sector. During a Read Long command, the drive does not check the ECC bytes to determine if there has been a data error. Only single sector Read Long operations are supported.

The transfer of the ECC bytes shall be 8 bits wide and 4 or device native ECC bytes length.

8.2.17 Read Multiple Command (C4h, 29h: extended)

The Read Multiple command performs similarly to the Read Sectors command except interrupts are not generated on every sector, but on the transfer of a block which contains the number of sectors defined by a Set Multiple command.

Command execution is identical to the Read Sectors operation except that the numbers of sectors as defined by a Set of Multiple command are transferred without intervening interrupts. DRQ qualification of the transfer is required only at the start of the data block, not on each sector.

The block count of sectors to be transferred without intervening interrupts is programmed by the Set Multiple Mode command, which should be executed prior to the Read Multiple command. When the Read Multiple command is issued, the Sector Count register contains the number of sectors (not the number of blocks or the block count) requested.

If the number of requested sectors is not evenly divisible by the block count, as many full blocks as possible are transferred, followed by a final, partial block transfer. The partial block transfer shall be for n sectors, where

n = Remainder (Sector Count / Block Count)

If the Read Multiple command is attempted before the Set Multiple Mode command has been executed or when Read Multiple commands are disabled, then the Read Multiple operation is rejected with an Aborted Command error.

Disk errors encountered during Read Multiple commands are posted at the beginning of the block or partial block transfer, but DRQ is still set and the data transfer takes place as it normally would, including transfer of corrupted data, if any.

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Samsung M8-DVR manual Read Log Extended 2Fh, Read Long 22h, Read Multiple Command C4h, 29h extended
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M8-DVR specifications

The Samsung M8-DVR is an advanced digital video recorder designed to meet the ever-evolving demands of modern surveillance and recording needs. This cutting-edge device combines state-of-the-art technology with user-friendly features, making it a reliable choice for both residential and commercial applications.

At the core of the M8-DVR’s design is its high-definition recording capability. The device supports various resolutions, including Full HD 1080p, ensuring that all captured footage is crystal clear. This clarity is crucial for identifying details, whether for security purposes or monitoring activities around the clock. It can accommodate multiple camera inputs, allowing users to expand their surveillance network seamlessly.

One of the standout features of the M8-DVR is its remarkable storage capacity. Equipped with advanced hard disk technology, it can store several terabytes of footage, which can be further expanded using additional drives. This means that even with continuous recording, users won’t have to worry about running out of storage quickly. The device also incorporates efficient compression technologies, such as H.265, which allows for reduced file sizes without sacrificing video quality.

In terms of connectivity, the M8-DVR offers various options, including Ethernet ports for network connectivity, USB ports for data transfer, and HDMI output for direct connection to monitors. This versatility allows users to easily stream live footage or review recordings on larger screens. The device supports remote viewing through mobile applications, allowing users to monitor their property from virtually anywhere in real-time.

User experience is further enhanced by an intuitive interface that makes navigation simple and efficient. It includes features like motion detection and alerts, which notify users of any unusual activities. The advanced search function is another highlight, enabling users to quickly locate specific events in their recordings without long hours of scrolling.

The Samsung M8-DVR is also designed with durability in mind. It comes with robust security features to protect against unauthorized access and offers backup options to prevent data loss. With its blend of technology, storage capabilities, and user-friendly design, the Samsung M8-DVR stands out as a comprehensive solution for modern video surveillance needs, making it an essential tool for enhancing security and peace of mind in any environment.
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