Is the IDE (UDMA mode 4) data rate the same as IDE (UDMA-66)?

Yes, both IDE (UDMA mode 4) and IDE (UDMA-66) share a maximum theoretical throughput of about 66.7 megabytes per second and are considered equivalent in this converter.

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

An 80-conductor Parallel ATA cable is required to support reliable signaling for IDE (UDMA-66) transfer mode.

Can this converter be used for modern SATA devices?

No, this converter specifically supports the legacy Parallel ATA (PATA) IDE transfer modes from older devices and is not applicable to modern SATA standards.

How to Convert from IDE (UDMA mode 4) to IDE (UDMA-66)?

Easily convert values between IDE (UDMA mode 4) and IDE (UDMA-66), legacy PATA data transfer modes used in older storage devices and systems from the late 1990s and early 2000s.

IDE (UDMA mode 4)

IDE (UDMA-66)

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

IDE (UDMA mode 4) to IDE (UDMA-66) Conversion Table

IDE (UDMA mode 4)	IDE (UDMA-66)

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 4) to IDE (UDMA-66) Conversion Table
IDE (UDMA mode 4)	IDE (UDMA-66)

Explore More Data Transfer Units Converter

What Is This Tool?

This converter transforms values between IDE (UDMA mode 4) and IDE (UDMA-66), two Parallel ATA transfer modes that define the data transfer rate for legacy PATA drives using the Ultra DMA protocol at a maximum theoretical speed of approximately 66.7 megabytes per second.

How to Use This Tool?

Enter the numeric value in IDE (UDMA mode 4) units that you want to convert.
Select IDE (UDMA mode 4) as the source unit and IDE (UDMA-66) as the target unit.
Click the convert button to see the equivalent value in IDE (UDMA-66).
Use the tool to verify or standardize data transfer rates for legacy PATA storage devices.

Key Features

Converts values between IDE (UDMA mode 4) and IDE (UDMA-66) with a 1:1 equivalence.
Supports legacy data transfer specifications from late 1990s to early 2000s PATA devices.
Browser-based and easy-to-use interface without installation.
Ideal for benchmarking and maintaining older IDE storage hardware.

Examples

5 IDE (UDMA mode 4) equals 5 IDE (UDMA-66).
10 IDE (UDMA mode 4) converts to 10 IDE (UDMA-66).

Common Use Cases

Connecting and configuring PATA/IDE hard drives and optical drives from the late 1990s or early 2000s supporting ATA-66.
Troubleshooting or setting DMA modes within BIOS or firmware on legacy desktop and embedded systems.
Benchmarking and maintaining older storage hardware in data recovery or embedded system debugging.
Specifying or verifying maximum burst throughput of legacy PATA devices.

Tips & Best Practices

Use the converter to ensure consistent data transfer rate definitions across legacy IDE devices.
Verify cable quality and system compatibility when working with IDE (UDMA-66) to achieve reliable signaling.
Refer to BIOS or device documentation to correctly configure transfer modes matching your hardware capabilities.
Consider potential hardware aging or environmental factors that may affect actual data transfer performance.

Limitations

Conversion is based on defined transfer mode equivalence without reflecting actual transfer speeds under real conditions.
Maximum theoretical throughput of 66.7 megabytes per second may not be attained due to hardware age, cable quality, or system limitations.
The tool does not account for performance variability or device-specific behavior outside defined standards.

Frequently Asked Questions

Is the IDE (UDMA mode 4) data rate the same as IDE (UDMA-66)?: Yes, both IDE (UDMA mode 4) and IDE (UDMA-66) share a maximum theoretical throughput of about 66.7 megabytes per second and are considered equivalent in this converter.
What kind of cable is required for IDE (UDMA-66)?: An 80-conductor Parallel ATA cable is required to support reliable signaling for IDE (UDMA-66) transfer mode.
Can this converter be used for modern SATA devices?: No, this converter specifically supports the legacy Parallel ATA (PATA) IDE transfer modes from older devices and is not applicable to modern SATA standards.

Key Terminology

IDE (UDMA mode 4): A Parallel ATA transfer mode using the Ultra DMA protocol with a theoretical throughput of approximately 66.7 MB/s, requiring an 80-conductor cable for data transfer.
IDE (UDMA-66): Also called Ultra DMA Mode 4 or ATA-66, it is a Parallel ATA transfer mode specifying a maximum theoretical raw data rate of 66.7 MB/s with cable requirements matching legacy PATA devices.
80-conductor Parallel ATA cable: A specialized IDE cable with 80 conductors required to ensure reliable high-speed data signaling in IDE (UDMA-66) and similar modes.

Quick Knowledge Check

What is the maximum theoretical data rate for IDE (UDMA mode 4)?

33.3 megabytes per second

66.7 megabytes per second

100 megabytes per second

Which cable is necessary for IDE (UDMA-66) to function properly?

40-conductor IDE cable

80-conductor Parallel ATA cable

SATA cable

What is a common use case for converting IDE (UDMA mode 4) to IDE (UDMA-66)?

Upgrading to new SSD drives

Verifying data transfer settings on legacy PATA devices

Converting USB data rates

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