Decreasing below the 2MB recommended value is usually not advised.Rings are my favorite piece of jewelry to collect, wear, and make. However, increasing the read buffer size might help when copying to software raids on OS X. The read buffer size settings use «2MB, recommended» as default. If the drive is the limiting factor, find out if the drive is exchangeable with a similar or newer drive with better performance. Maybe there is a card reader with a faster interface available. If the interface is the limiting factor, maybe you can change that by switching the enclosure with a better interface. If you experience completely odd values, maybe something is configured wrong (attaching a USB3 drive to a USB2-only port) or a component is faulty. You can now relate these values to your measured values for the entire device.
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