What is IDE (UDMA mode 1)?

IDE (UDMA mode 1) is an Ultra DMA transfer mode for Parallel ATA devices providing a theoretical maximum transfer rate of about 25 MB/s, used mainly for older PATA drives.

How does IDE (PIO mode 1) differ from UDMA modes?

IDE (PIO mode 1) involves CPU-controlled data transfers with higher CPU overhead and lower throughput compared to DMA modes like UDMA.

Why should I convert between IDE (UDMA mode 1) and IDE (PIO mode 1)?

Converting helps compare transfer rates and diagnose or configure legacy devices where different transfer protocols affect performance and CPU load.

How to Convert from IDE (UDMA mode 1) to IDE (PIO mode 1)?

Learn to convert data transfer units from IDE (UDMA mode 1) to IDE (PIO mode 1) with this easy-to-use online converter. Understand transfer rates and optimize legacy PATA device configurations.

IDE (UDMA mode 1)

IDE (PIO mode 1)

Please check your input. It must be a valid numeric value.

IDE (UDMA mode 1) to IDE (PIO mode 1) Conversion Table

IDE (UDMA mode 1)	IDE (PIO mode 1)

Custom Unit Conversion Table Generator – Instant Printable Conversion Tables

Start Value

Enter the starting number (positive decimal or integer ≥ 0). Example: 0.1, 1, 5.

End Value

Enter the ending number (positive decimal or integer > Start Value). Example: 10, 50, 100.

Interval

Enter the step size (positive decimal > 0 and < End Value – Start Value). Example: 1.0, 2.5.

IDE (UDMA mode 1) to IDE (PIO mode 1) Conversion Table
IDE (UDMA mode 1)	IDE (PIO mode 1)

Explore More Data Transfer Units Converter

What Is This Tool?

This unit converter allows you to convert data transfer rates between IDE (UDMA mode 1) and IDE (PIO mode 1), two transfer protocols used with legacy Parallel ATA (PATA) devices. It helps you compare throughput differences for vintage PCs and embedded systems.

How to Use This Tool?

Enter the value in IDE (UDMA mode 1) units you want to convert
Select IDE (PIO mode 1) as the target unit
Click the convert button to obtain the equivalent value
Use the conversion results to analyze transfer rates or troubleshoot devices

Key Features

Converts data transfer units between IDE (UDMA mode 1) and IDE (PIO mode 1)
Based on ATA/PATA standard-defined transfer modes for legacy storage devices
Provides quick and accurate conversion using a defined conversion rate
Supports troubleshooting and benchmarking of older PATA drives
Browser-based and easy to use without installation

Examples

2 IDE (UDMA mode 1) = 9.6153846154 IDE (PIO mode 1)
0.5 IDE (UDMA mode 1) = 2.40384615385 IDE (PIO mode 1)

Common Use Cases

Specifying or diagnosing BIOS or drive transfer settings on vintage PCs
Benchmarking maximum throughput of older IDE hard disks and optical drives
Troubleshooting cable or controller compatibility and data errors
Configuring or debugging firmware and drivers requiring CPU-controlled transfers
Maintaining industrial equipment and embedded systems using legacy PATA devices

Tips & Best Practices

Verify hardware and cable quality to ensure accurate transfer rates
Understand that PIO modes increase CPU overhead compared to UDMA modes
Use this conversion to compare theoretical transfer speeds, not exact real-world rates
Consider device-specific implementations when diagnosing performance
Combine conversion insights with practical hardware tests for troubleshooting

Limitations

Actual speeds may vary due to hardware state, cable quality, and controller compatibility
PIO transfer modes have higher CPU load and lower efficiency than UDMA modes
Theoretical maximum transfer rates don’t always match real-world throughput due to timing and error-checking

Frequently Asked Questions

What is IDE (UDMA mode 1)?: IDE (UDMA mode 1) is an Ultra DMA transfer mode for Parallel ATA devices providing a theoretical maximum transfer rate of about 25 MB/s, used mainly for older PATA drives.
How does IDE (PIO mode 1) differ from UDMA modes?: IDE (PIO mode 1) involves CPU-controlled data transfers with higher CPU overhead and lower throughput compared to DMA modes like UDMA.
Why should I convert between IDE (UDMA mode 1) and IDE (PIO mode 1)?: Converting helps compare transfer rates and diagnose or configure legacy devices where different transfer protocols affect performance and CPU load.

Key Terminology

IDE (UDMA mode 1): An Ultra DMA transfer mode of the Parallel ATA interface offering a theoretical maximum transfer rate of about 25 MB/s used in older PATA devices.
IDE (PIO mode 1): A Programmed Input/Output transfer mode where the CPU controls each data transfer cycle, resulting in higher CPU usage and lower throughput.
PATA: Parallel ATA, an interface standard for connecting storage devices such as hard drives and optical drives.

Quick Knowledge Check

What does IDE (UDMA mode 1) primarily provide?

CPU-controlled data transfers

Ultra DMA transfer mode with ~25 MB/s raw rate

Highest throughput among modern interfaces

Which mode has higher CPU overhead, IDE (PIO mode 1) or IDE (UDMA mode 1)?

IDE (PIO mode 1)

IDE (UDMA mode 1)

Both have the same overhead

What is a common reason to convert from IDE (UDMA mode 1) to IDE (PIO mode 1)?

To upgrade to faster modern drives

To compare transfer rates for diagnosing legacy devices

To reduce CPU usage

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