Can this adapter be used with external drives larger than 6TB, or is 6TB the maximum supported capacity?

The maximum supported capacity is 6TB.

How fast is the data transfer rate with the USB 3.0 connection on this adapter?

The data transfer rate with the USB 3.0 connection on this adapter supports speeds up to 5Gbps.

Is the included 12V 2A power adapter sufficient for powering a 3.5-inch IDE drive?

Yes, the included 12V 2A power adapter is sufficient for powering a 3.5-inch IDE drive.

Does this adapter support both 2.5-inch and 3.5-inch drives simultaneously, or is it one at a time?

Yes, this adapter supports access to both 2.5-inch and 3.5-inch drives simultaneously.

Questions & Answers: Jansicotek SATA/IDE to USB 3.0 Adapter, Hard Drive Adapter Cable Converter for Universal 2.5/3.5 Inch IDE and SATA External HDD SSD, Support 6TB, 12V 2A Power Adapter included

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Jansicotek SATA/IDE to USB 3.0 Adapter, Hard Drive Adapter Cable Converter for Universal 2.5/3.5 Inch IDE and SATA External HDD SSD, Support 6TB, 12V 2A Power Adapter included

Get All Your Drives Active Combo: USB 3.0 to SATA IDE Converter allows you to connect 2.5"/3.5" IDE/SATA hard disks through USB port to the computer. This is a perfect tool to duplicate, copy, backup or transfer large amounts of data from one drive to another. It has a SATA II connector and two IDE connectors (40pin and 44pin).
Access to 3 Drives Simultaneously: This usb sata adapter enables access to all three HDD drives simultaneously or file transfer among the 3 drives. It supports 2.5 "/3.5" SATA HDD and SSD; 2.5"/3.5" IDE HDD.
Specification
Supported Drives: 2.5"/3.5" SATA HDD/SSD; 2.5"/3.5" IDE HDD; DVD-ROM, CD-ROM, CD-RW, DVD-RW, DVD+RW;
Compatible Systems: Windows8/7/10/Vista/XP/Mac OS 9/10/Linux;
Supports drives with a capacity of up to 6 TB;
Support speed up to 5Gbps;
Backward compatible with USB 2.0/1.1;
On/Off Switch for HDD protection;
DC Power Supply 12V included for 3.5" devices ;
LED activity indicator, Plug & Play, simple, reliable and stable

$29^.99 –