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Ultra DMA increased the DMA transfer rate from ATA-2's 16.67 MBps to 33.33 MBps. With the inclusion of ATAPI, ATA-4 immediately improved the removable media support of ATA. Before ATA-4, ATAPI was a completely separate standard. ATAPI provides a common interface for CD-ROM drives, tape backup drives and other removable storage devices. #STANDARD IDE ATA ATAPI CONTROLLERS DRIVER PASSWORD#ATA-3 also adds password protection to access drives, providing a valuable security feature.ĪTA-4 - Probably the two biggest additions to the standard in this version are Ultra DMA support and the integration of the AT Attachment Program Interface (ATAPI) standard. ATA-3 - With the addition of Self-Monitoring Analysis and Reporting Technology (SMART), IDE drives were made more reliable. #STANDARD IDE ATA ATAPI CONTROLLERS DRIVER FULL#Newer BIOS versions increased the bit size for CHS, providing support for the full 137.4 gigabytes. If you multiply 1,024 x 256 x 63 x 512, you will get 8,455,716,864 bytes or approximately 8.4 gigabytes. This is because a sector cannot begin with zero. You will note that the number of sectors is 63 instead of 64. CHS has a fixed length for each part of the address: The reason for the big discrepancy between total hard drive size and CHS hard drive support is because of the bit sizes used by the basic input/output system ( BIOS) for CHS. CHS is how the system determines where the data is located on a hard drive. ATA-2 provided standard translation methods for Cylinder Head Sector (CHS) for hard drives up to 8.4 gigabytes in size. The total hard drive size supported increased to 137.4 gigabytes. ATA-2 is often called EIDE (Enhanced IDE), Fast ATA or Fast ATA-2. ATA-2 provides power management, PCMCIA card support and removable device support. Standard DMA transfer rates increased from 4.16 megabytes per second (MBps) in ATA-1 to as many as 16.67 MBps. ATA-1 is more commonly known as IDE.ĪTA-2 - DMA was fully implemented beginning with the ATA-2 version. DMA means that the drive sends information directly to memory, while PIO means that the computer's central processing unit (CPU) manages the information transfer. Additionally, ATA-1 provides signal timing for direct memory access (DMA) and programmed input/output (PIO) functions. In the 44-pin version, the extra four pins are used to supply power to a drive that doesn't have a separate power connector. ATA-1 was based on a subset of the standard ISA 96-pin connector that uses either 40 or 44 pin connectors and cables. It instituted the use of a master/slave configuration. There are several variations of ATA, each one adding to the previous standard and maintaining backward compatibility.ĪTA-1 - The original specification that Compaq included in the Deskpro 386. ![]()
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