ISO 3166-2 geocode for Argentina. This is used as an international standard for shipping to Argentina. Each Argentinian province has its own code with the prefix AR.. For example, the code for the Province of Buenos Aires is ISO 3166-2:AR-B.
The USB 2.0 interface can be a limit due to signalling and command overhead as well as spacing between packets. I have a fast SSD connected by USB 2.0. The drive is much faster than the interface (by more a factor of 10). Read Speed maxes out around 33 MB/s and Write Speed at 17.5 MB/s. Write Speeds are almost 50% slower due to a verify-read after the write and the fact that the USB signal is half-duplex as another answer mentions.
IO-Data, well known for its myriad storage products, has announced their latest SSD model, SSDN-3TB. Built around a new Toshiba 6Gbps storage controller, it will deliver read and write speeds of up to 480 MB/s and 350MB/s respectively.n addition, random performance is pegged at 73k IOPS for reads and 58k IOPS when it comes to writes. Initially available in Japan, the new drives should go on sale later this month, with the 120 GB model being priced at around $206.