What does IDE (UDMA-66) mean?

IDE (UDMA-66), also known as Ultra DMA Mode 4 or ATA‑66, is a Parallel ATA transfer mode that defines a maximum theoretical raw data rate of 66.7 megabytes per second using an 80-conductor PATA cable.

What is IDE (PIO mode 2)?

PIO mode 2 is a timing specification for ATA/IDE interfaces that specifies CPU-driven programmed I/O transfer cycles and is used by older IDE drives for data transfers.

Why convert IDE (UDMA-66) to IDE (PIO mode 2)?

Conversion helps in configuring legacy systems, diagnosing compatibility or performance issues, and understanding how burst transfers relate to programmed I/O cycles on older IDE devices.

How to Convert from IDE (UDMA-66) to IDE (PIO mode 2)?

Convert data transfer rates from IDE (UDMA-66) to IDE (PIO mode 2) with this easy-to-use online unit converter tool for legacy IDE hardware configurations.

IDE (UDMA-66)

IDE (PIO mode 2)

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

IDE (UDMA-66) to IDE (PIO mode 2) Conversion Table

IDE (UDMA-66)	IDE (PIO mode 2)

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-66) to IDE (PIO mode 2) Conversion Table
IDE (UDMA-66)	IDE (PIO mode 2)

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What Is This Tool?

This converter helps translate data transfer rates between IDE (UDMA-66), a fast parallel ATA burst transfer mode, and IDE (PIO mode 2), a slower programmed I/O timing mode. It is designed for understanding and configuring legacy IDE drive transfer modes and compatibility.

How to Use This Tool?

Enter the value in IDE (UDMA-66) units you want to convert.
Select IDE (PIO mode 2) as the target unit.
View the converted result based on the established conversion rate.
Use the output to assist with legacy system configuration or diagnostics.

Key Features

Converts data transfer rates specifically between IDE (UDMA-66) and IDE (PIO mode 2).
Reflects theoretical maximum transfer capabilities of legacy IDE storage devices.
Browser-based and easy to use without installation.
Supports troubleshooting and configuration of vintage PC storage settings.

Examples

1 IDE (UDMA-66) equals approximately 7.95 IDE (PIO mode 2).
5 IDE (UDMA-66) converts to roughly 39.76 IDE (PIO mode 2).

Common Use Cases

Configuring drive transfer modes for legacy IDE hard drives in BIOS or firmware.
Troubleshooting transfer speed or data errors on older PATA IDE systems.
Evaluating benchmark results and device driver reports for IDE storage devices.
Managing compatibility issues on vintage PCs or systems that fallback from DMA to PIO.

Tips & Best Practices

Consider hardware condition and cable quality as they affect real throughput.
Use the conversion to understand relative performance rather than exact speeds.
Refer to this tool when configuring or diagnosing legacy IDE devices and operating systems.
Be aware that PIO mode 2 is significantly slower and less efficient than UDMA-66.

Limitations

Values represent theoretical transfer rates and not actual data throughput.
Actual performance depends on hardware health, cable quality, and system setup.
PIO mode 2 is inherently slower and less efficient compared to UDMA-66 mode.
Direct performance comparisons should account for differences in transfer mechanisms.

Frequently Asked Questions

What does IDE (UDMA-66) mean?: IDE (UDMA-66), also known as Ultra DMA Mode 4 or ATA‑66, is a Parallel ATA transfer mode that defines a maximum theoretical raw data rate of 66.7 megabytes per second using an 80-conductor PATA cable.
What is IDE (PIO mode 2)?: PIO mode 2 is a timing specification for ATA/IDE interfaces that specifies CPU-driven programmed I/O transfer cycles and is used by older IDE drives for data transfers.
Why convert IDE (UDMA-66) to IDE (PIO mode 2)?: Conversion helps in configuring legacy systems, diagnosing compatibility or performance issues, and understanding how burst transfers relate to programmed I/O cycles on older IDE devices.

Key Terminology

IDE (UDMA-66): A Parallel ATA transfer mode with a peak theoretical data rate of 66.7 MB/s requiring an 80-conductor PATA cable, used for burst data transfer on legacy IDE devices.
IDE (PIO mode 2): An ATA/IDE timing standard that specifies how data is transferred via CPU-driven programmed I/O cycles in older IDE drives.
Programmed Input/Output (PIO): A method where data transfers are controlled directly by the CPU, typically slower and less efficient than DMA modes.

Quick Knowledge Check

What type of cable is required for IDE (UDMA-66)?

40-conductor PATA cable

80-conductor PATA cable

SATA cable

Which mode is CPU-driven and uses programmed I/O cycles?

IDE (UDMA-66)

IDE (PIO mode 2)

SATA III

Why should you be cautious when comparing performance between UDMA-66 and PIO mode 2?

Because both modes have the same speed.

Because PIO mode 2 is slower and less efficient than UDMA-66.

Because PIO mode 2 uses newer technology.

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