Copying file to SSD speed question

[Ragahv]

Hey i need to know if its worth buying an ssd for copying large files of 10gb from a mechanical hard disk like the WD10EZEX Sata 3/64MB Cache to a :

Sandisk 240GB SSD 500MB/s Read speed and 380MB/s Write speed and from it to the WD10EZEX hard drive. Can you please tell me how many minutes it would take to transfer this 10Gb file if the write speed was 400MB/s. if its 400MB/s then it would take around 1 minute correct? if my 7200RPM hard drive downloads 360KB/s to a 1tb hard drive with moving parts, then the ssd is faster and takes only 1minute or less?

If you know of an ssd with a write and read speed of 600MB/s or more can you please tell me?
If there such thing as GB per second? NOT the sata rate. I know some ssd have 500MB write and 380MB read but they also say it has 6gb/s sata rate and thats really confusing. Thanks.

 

[dudeman509]

6 gigabits per second = 750 MB/sec total throughput. Minus some overhead for r/w operations, so realistically around 600 MB/s. 1 Gigabyte per second isn't possible on SATA even if there were fast enough flash memory (there isn't - not in standard consumer-grade drives).

Byte(B) = 8 bits (b). Confusing terminology.

 

[atheus]

Your SSD would not be the bottleneck in this situation, since you're reading from a HDD. The Hard Drive can only read at about 150 MB/s, so if that's what you're reading from, it doesn't matter if you have 500 MB/s or 10,000 MB/s write, you're going to write at 150 MB/s, which means the transfer would take 67 seconds. At 400 MB/s it would take 25 seconds – but you would need to be transferring between two SSD's to make that happen.

Speaking to the rest of your question, though, SATA SSD's top out at about 550 MB/s, because the theoretical limit of SATA 3 is 600 MB/s. For anything faster you need a different interface like PCIE, M.2, or the like — which means a much more expensive drive, and potentially a motherboard upgrade depending on what you're trying to do with it.

 

[nukemaster]

You file transfers are only as fast as the slowest link.

For this reason, an internet download tends to be slower than transfers from drive to drive.

So even if an SSD can write 400 megabytes per second, if the hard drive can only read at 100 megabytes a second that will be the transfer rate.

Many hard drives have transfer rates over 100 megabytes a second on sequential writes, but fall allot for random writes/reads.

Short story, slowest link sets the speed. If you get an SSD, It would me best to use it for your OS because you will have LOTS of random read/write operations and SSDs are great for that.