What does IDE (UDMA mode 4) mean?

It refers to a Parallel ATA transfer mode called Ultra DMA/66, with a theoretical maximum throughput of around 66.7 megabytes per second using an 80-conductor IDE cable.

Why convert IDE (UDMA mode 4) to IDE (UDMA mode 0)?

Converting helps compare and troubleshoot data transfer rates between faster and slower legacy Ultra DMA modes, useful for maintenance, diagnostics, and benchmarking of PATA/IDE devices.

Does this tool provide exact real-world transfer speeds?

No, it provides a theoretical conversion based on maximum transfer rates. Actual speeds depend on hardware condition, cable quality, and system configuration.

How to Convert IDE (UDMA mode 4) to IDE (UDMA mode 0)

Learn how to convert data transfer units from IDE (UDMA mode 4) to IDE (UDMA mode 0). Understand the conversion process, use cases, and key differences between these Parallel ATA transfer modes.

IDE (UDMA mode 4)

IDE (UDMA mode 0)

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

IDE (UDMA mode 4) to IDE (UDMA mode 0) Conversion Table

IDE (UDMA mode 4)	IDE (UDMA mode 0)

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 mode 0) Conversion Table
IDE (UDMA mode 4)	IDE (UDMA mode 0)

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What Is This Tool?

This converter allows you to translate data transfer speeds from IDE (UDMA mode 4), a faster Parallel ATA transfer mode, to IDE (UDMA mode 0), a slower mode. It helps compare performance levels between these Ultra DMA protocols for legacy PATA/IDE devices.

How to Use This Tool?

Enter the value in IDE (UDMA mode 4) transfer units you want to convert
Choose IDE (UDMA mode 0) as the target unit for conversion
Click the convert button to obtain the equivalent data transfer rate
Use the results to compare or diagnose legacy data transfer performance

Key Features

Converts data transfer rates between IDE (UDMA mode 4) and IDE (UDMA mode 0)
Supports legacy Parallel ATA (PATA/IDE) transfer modes
Provides a theoretical conversion based on maximum transfer speeds
Helps troubleshoot and benchmark older storage devices
Browser-based and easy to use for quick data rate comparisons

Examples

1 IDE (UDMA mode 4) converts to approximately 3.98 IDE (UDMA mode 0)
5 IDE (UDMA mode 4) equals about 19.88 IDE (UDMA mode 0)

Common Use Cases

Connecting and maintaining PATA/IDE hard drives or optical drives from late 1990s and early 2000s PCs
Configuring or troubleshooting DMA timing settings in BIOS or firmware for legacy systems
Benchmarking or recovering data from older IDE hardware
Comparing throughput limits when upgrading from PATA to newer interfaces like SATA or USB

Tips & Best Practices

Verify your hardware supports the specified DMA mode before conversion
Use an 80-conductor IDE cable to ensure reliable signaling for UDMA modes
Refer to BIOS or device driver settings when troubleshooting performance issues
Remember this conversion reflects theoretical maximum speeds; real-world rates may vary

Limitations

The conversion is based on maximum theoretical transfer rates only
Actual data throughput can differ due to hardware condition, cable quality, and system setup
Does not account for specific device or system performance factors

Frequently Asked Questions

What does IDE (UDMA mode 4) mean?: It refers to a Parallel ATA transfer mode called Ultra DMA/66, with a theoretical maximum throughput of around 66.7 megabytes per second using an 80-conductor IDE cable.
Why convert IDE (UDMA mode 4) to IDE (UDMA mode 0)?: Converting helps compare and troubleshoot data transfer rates between faster and slower legacy Ultra DMA modes, useful for maintenance, diagnostics, and benchmarking of PATA/IDE devices.
Does this tool provide exact real-world transfer speeds?: No, it provides a theoretical conversion based on maximum transfer rates. Actual speeds depend on hardware condition, cable quality, and system configuration.

Key Terminology

IDE (UDMA mode 4): A Parallel ATA transfer mode using Ultra DMA protocol at about 66.7 MB/s with an 80-conductor cable, also known as Ultra DMA/66 or ATA-4.
IDE (UDMA mode 0): The slowest Ultra DMA transfer mode for PATA devices, defined by interface timing with a maximum data transfer rate near 16.7 MB/s.
Ultra DMA: A protocol for moving blocks of data between drives and hosts using DMA and improved transfer speeds over older PATA interfaces.

Quick Knowledge Check

What is the approximate conversion rate from IDE (UDMA mode 4) to IDE (UDMA mode 0)?

1 IDE (UDMA mode 4) = 2 IDE (UDMA mode 0)

1 IDE (UDMA mode 4) = 3.98 IDE (UDMA mode 0)

1 IDE (UDMA mode 4) = 10 IDE (UDMA mode 0)

Which cable type is required for reliable signaling in IDE (UDMA mode 4)?

40-conductor IDE cable

80-conductor IDE cable

USB cable

What is a common use case for converting IDE (UDMA mode 4) to IDE (UDMA mode 0)?

Upgrading to SATA devices

Troubleshooting DMA modes in legacy systems

Transferring files over the internet

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