If you're like me and you invested in an expensive laptop with lots of VRAM for graphic presentations which works great, but isn't so portable, it may be time to consider investing in an easier to carry laptop. Prices for new laptops are very low these. I just purchased a Asus laptop with a 11.6 inch screen which can be bought here for less than $150. It only weights 2 pounds and is listed as getting 12 hours of battery life. I am using it right now and I have not encountered any problems. The widespread use of tablets and smartphones means that manufacturers have no choice but to slash prices. But having a keyboard and a Windows operating system lets you do so much more. I'm sure having a top of the line Surface Pro would be nicer, but for the money you could afford to get a new one of these laptops every year. Note that the Asus laptop referenced above is a reconditioned device.
Here's a brief breakdown of the most widely used interfaces for computing devices.
Back in the olden days, parallel ports were used which could reach a bit rate of up to 2 MB per second. These were commonly used with PCs to attach printers.
SCSI interfaces (Small Computer System Interfaces) are used to attach peripherals to computers, and can transfer data at 80 MBs per second. More than one device can be attached via a single SCSI port.
ATA or (IDE - Integrated Drive Electronics) connects hard disk drives and CD-ROM drives and can transfer up to 100 MBs per second.
Serial Attached SCSI (SAS) supports data transfer at 3 GBs per second. Note that serial connections transfer data in a single stream in contrast to parallel interfaces.
Serial ATA (SATA) runs at 150 MBs per second.