What does IDE (UDMA-33) mean?

IDE (UDMA-33), also called ATA/33 or Ultra DMA mode 4, is a Parallel ATA data transfer mode that uses direct memory access to move data with a maximum burst rate of 33.3 MB/s.

How is IDE (PIO mode 1) different from IDE (UDMA-33)?

IDE (PIO mode 1) is a CPU-controlled data transfer mode providing lower throughput and higher CPU usage compared to the DMA-based IDE (UDMA-33) mode.

Why convert between these two IDE data transfer modes?

Converting helps configure or troubleshoot legacy hardware, compare performance, and support development on vintage or embedded systems using different Parallel ATA modes.

Convert IDE (UDMA-33) to IDE (PIO mode 1) Data Transfer Units

Easily convert data transfer rates from IDE (UDMA-33) mode to IDE (PIO mode 1) mode. This tool helps translate between DMA-based and CPU-controlled Parallel ATA data transfer standards relevant for legacy hardware configuration and benchmarking.

IDE (UDMA-33)

IDE (PIO mode 1)

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

IDE (UDMA-33) to IDE (PIO mode 1) Conversion Table

IDE (UDMA-33)	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-33) to IDE (PIO mode 1) Conversion Table
IDE (UDMA-33)	IDE (PIO mode 1)

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What Is This Tool?

This converter allows you to change data transfer units from IDE (UDMA-33), a Direct Memory Access mode used in older Parallel ATA drives, to IDE (PIO mode 1), a CPU-controlled transfer mode. It supports users working with vintage PC hardware or embedded systems by facilitating comparisons and configurations of these legacy data-transfer modes.

How to Use This Tool?

Enter the numeric value in IDE (UDMA-33) units you want to convert
Select IDE (UDMA-33) as the source unit
Choose IDE (PIO mode 1) as the target unit
View the converted value based on the conversion rate
Use the results to assist with hardware configuration or performance benchmarking

Key Features

Converts between IDE (UDMA-33) and IDE (PIO mode 1) data transfer units
Supports benchmarking and configuring legacy Parallel ATA drives
Browser-based tool for quick and easy conversions
Provides clear comparisons between DMA and Programmed Input/Output modes

Examples

1 IDE (UDMA-33) equals approximately 6.35 IDE (PIO mode 1)
2 IDE (UDMA-33) converts to about 12.69 IDE (PIO mode 1)

Common Use Cases

Configuring and troubleshooting BIOS or controller transfer modes on legacy PCs
Developing or debugging firmware that requires CPU-driven PIO data transfers
Benchmarking performance of vintage hard drives and optical drives using different transfer standards
Comparing data transfer behaviors when upgrading or replacing older PATA devices

Tips & Best Practices

Always verify hardware compatibility when working with IDE (UDMA-33) or IDE (PIO mode 1) modes
Use this converter to understand relative data transfer rates between DMA and PIO modes
Consider controller and cable specifications when interpreting converted values
Apply conversions cautiously as theoretical values may vary in real-world scenarios

Limitations

Conversion represents theoretical equivalence between two fundamentally different transfer modes
Actual throughput and CPU overhead differ between IDE (UDMA-33) and IDE (PIO mode 1)
Real-world performance depends on hardware, controller, and cable quality
Not all devices or systems will support both transfer modes interchangeably

Frequently Asked Questions

What does IDE (UDMA-33) mean?: IDE (UDMA-33), also called ATA/33 or Ultra DMA mode 4, is a Parallel ATA data transfer mode that uses direct memory access to move data with a maximum burst rate of 33.3 MB/s.
How is IDE (PIO mode 1) different from IDE (UDMA-33)?: IDE (PIO mode 1) is a CPU-controlled data transfer mode providing lower throughput and higher CPU usage compared to the DMA-based IDE (UDMA-33) mode.
Why convert between these two IDE data transfer modes?: Converting helps configure or troubleshoot legacy hardware, compare performance, and support development on vintage or embedded systems using different Parallel ATA modes.

Key Terminology

IDE (UDMA-33): A Parallel ATA transfer mode using direct memory access allowing faster data movement between host and drive up to 33.3 MB/s.
IDE (PIO mode 1): A Programmed Input/Output data transfer mode where the CPU manages each data cycle, resulting in lower throughput and greater CPU load.
Parallel ATA (PATA): An interface standard for connecting storage devices such as hard drives and optical drives to a computer.

Quick Knowledge Check

What is the primary difference between IDE (UDMA-33) and IDE (PIO mode 1)?

UDMA-33 uses CPU control, PIO mode 1 uses DMA

UDMA-33 uses DMA, PIO mode 1 uses CPU control

Both use the same data transfer mechanism

What is a common use of IDE (PIO mode 1)?

Benchmarking new SSDs

Configuring or diagnosing legacy PATA drives in older equipment

Measuring wireless data transfer speeds

How many IDE (PIO mode 1) units equal 1 IDE (UDMA-33)?

Approximately 3.5

Approximately 6.35

Approximately 10.0

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