On Tue, Oct 13, 2015 at 1:54 PM, Anton Aylward
On 10/13/2015 01:42 PM, Greg Freemyer wrote:
I think the real reason is simply money. They put better parts in SSD than in thumb drives. Even the USB3 Sandisk thumb drives I buy are "slow".
No, there is some "technology" behind it.
* SATA and eSATA are 'star wired' whereas SB are bus wired.
If you have any other USB device around it will slow down (aka convey slowest speed) all otehr USB devices.
* SATA and eSTAT are autonomous devices whereas USB are CPU controlled.
Disks have a long history of being 'smart' and often integrated with some kind of DMA so that many blocks can ba transfered all at once. With the move to 4K and 4K file systems this can be accelerated.
USB isn't actually a character by character device like a UART but it is more demanding of the CPU than a disk.
From http://www.digitaltrends.com/computing/what-is-usb-3-1-when-will-it-be-relea... == The biggest improvement for the USB 3.1 standard is a boost in data
Anton, I think you underestimate the improvements of USB-3 over USB-2. There is also USB 3.1, but I don't have any of those devices yet. transfer bandwidth of up to 10 gigabits per second. The new SuperSpeed USB specification in Generation 2 of USB 3.1 delivers improved data encoding and efficiency, doubling the speed of the Generation 1 standard (5Gbps). == Back to USB-3 and my real world experience: I am a "heavy" USB-3 user. On my lab machine right now I have a 10-port USB-3 hub. Similar to http://amzn.com/B00GSLMTQ8 Connected to it are 2 (USB-3 <--> SATA) adapters. These are the adapters: http://www.frys.com/product/7157332?site=sr:SEARCH:MAIN_RSLT_PG In the adapters I have 2 1TB SSD drives. http://www.frys.com/product/8144495?site=sr:SEARCH:MAIN_RSLT_PG I also have 2 1.5TB USB-3 drives plugged into ithe hub. I semi-routinely copy 100GB of data from one of those drives to another. I also do large scale binary searches of the data. Let me assure you that from a performance perspective USB-3 is close to SATA. What is not close is a 16GB Sandisk USB-3 Thumb drive, nor any other thumb drive I have used. Thumb drives simply have slow electronics and it has nothing to do with the USB-3 interface. Greg -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org