What Is This Tool?
This converter allows users to transform values from IDE (UDMA mode 1) transfer rates to IDE (DMA mode 0) rates. It is designed for use with legacy Parallel ATA (PATA) devices and provides insight into the relationship between different IDE transfer modes.
How to Use This Tool?
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Enter the value in IDE (UDMA mode 1) units that you want to convert.
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Select IDE (DMA mode 0) as the target unit.
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Click convert to see the equivalent transfer rate in IDE (DMA mode 0).
Key Features
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Converts data transfer rates between IDE (UDMA mode 1) and IDE (DMA mode 0).
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Supports legacy Parallel ATA device compatibility analysis.
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Provides theoretical maximum transfer rate conversions.
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Browser-based and easy to use for vintage PC maintenance and driver development.
Examples
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1 IDE (UDMA mode 1) equals 5.9523809524 IDE (DMA mode 0).
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2 IDE (UDMA mode 1) equals 11.9047619048 IDE (DMA mode 0).
Common Use Cases
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Configuring BIOS/drive settings for vintage PCs using Parallel ATA interfaces.
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Benchmarking old IDE hard disks or optical drives to assess expected maximum throughput.
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Troubleshooting compatibility and data errors related to DMA and UDMA mode selections.
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Developing OS or BIOS drivers that detect and set IDE DMA modes during system startup.
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Operating embedded or industrial systems relying on legacy IDE interfaces to minimize CPU load.
Tips & Best Practices
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Use this converter to verify compatibility when switching IDE transfer modes on legacy hardware.
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Consider that actual performance can differ due to hardware and cable conditions.
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Apply the conversion for diagnostics or driver configuration in vintage PC environments.
Limitations
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Transfer rates are theoretical maximums and can vary based on hardware quality and conditions.
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Both IDE (UDMA mode 1) and IDE (DMA mode 0) are outdated technologies replaced by newer standards like SATA, limiting their applicability.
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Converter does not account for actual throughput variations caused by system or controller constraints.
Frequently Asked Questions
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What is IDE (UDMA mode 1)?
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IDE (UDMA mode 1) is an Ultra DMA transfer mode for Parallel ATA devices providing a maximum theoretical raw transfer rate of about 25 MB/s.
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What does IDE (DMA mode 0) represent?
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IDE (DMA mode 0) is the lowest-speed direct memory access mode in ATA/IDE devices, enabling the drive to transfer data blocks directly to system memory without CPU intervention.
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Why convert between these two modes?
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Converting helps users configure legacy Parallel ATA devices properly, diagnose performance issues, and ensure compatibility between different DMA and UDMA transfer settings.
Key Terminology
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IDE (UDMA mode 1)
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An Ultra DMA transfer mode in the Parallel ATA interface offering a theoretical maximum transfer rate near 25 MB/s for older PATA devices.
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IDE (DMA mode 0)
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The first defined direct memory access mode for ATA/IDE devices enabling low-speed data transfer directly to system memory without CPU-driven I/O.
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Parallel ATA (PATA)
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A legacy interface standard for connecting storage devices like hard drives and optical drives, supporting various DMA transfer modes.