Quick overview:
In DMA mode, drives access the memory directly (DMA = Direct Memory Access). This saves CPU resources because otherwise the data would run directly through the processor. The difference is clearly noticeable.
To do this, go to the "Control Panel" and open "System". Now click on Hardware > Device Manager. When this appears, click on the small plus in front of IDE ATA/ATAPI Controller. Then first double-click on the entry Primary IDE channel. Click on the Advanced settings tab at the top. For both devices displayed, select Transfer mode > DMA, if available. Now click on OK.
2. Proceed in the same way with the second entry Secondary IDE channel.
3. Restart the PC and check again in the Device Manager whether the current DMA mode actually says UltraDMA and not PIO mode. If this is the case, your drive does not support this mode.

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