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Slow Transfer Speed ??

T

Todd

n00b
Joined
Nov 1, 2007
Messages
32
Transferring files from one partition to another on an external MyBook is 7.5MB/sec. Any thoughts on why so slow?
 
Probably a combination of interface speed + seek time. Assuming USB 2, the effective interface speed is around 30 MB/s at best. A copy would have to come across USB and go back, so the overall throughput would be around 15 MB/s at best.

Inefficiencies in the implementation, file system overhead, and seek time going back and forth across the drive from the origin to the destination would reduce performance further.
 
USB = MAX 24mbps? i think it is... now take away overhead and other crap

firewire, better chance, but your macbook laptop drive is likely ony 5400RPM also, which wont help..
 
This is a 7200rpm USB 2.0 drive on Vista, from one partition to another; total HD size 1TB. Said it wanted three hours to transfer 75GB; 7.5MB/sec. Ouch :confused:
 
Todd said:
This is a 7200rpm USB 2.0 drive on Vista, from one partition to another; total HD size 1TB. Said it wanted three hours to transfer 75GB; 7.5MB/sec. Ouch :confused:
Click to expand...
You are reading from and writing to the same drive so its gonna be slow.
This 'can' make the performance less than half of copying to another drive (constant seeking considered too) although I find its usually about 50% speed due to faster reads than writes.

You can check the max speeds the drive and controller are capable of with HDTach or HDTune.
 
I've been dealing with that issue as well. It works faster if you copy down to another HD first then copy back to the right partition on your MyBook. Works faster. At least that will up and down per USB to local disk, at possibly 12-14mbps, then send back at same speed. If you do that way it's like up-down-up-down, which really cuts the speed.

Hope this helps...
 
LOL no wonder

USB2 - slow down right there
copying from same harddrive to same harddrive

your not cutting the USB speeds in half and then the harddrive basically as said.

partitions dont do jack and there is basically no reason to use them except to spilt your OS from your other important stuff so if windows dies, you can install it / repair with out losing docs / emails and crap
 
Phrik said:
I've been dealing with that issue as well. It works faster if you copy down to another HD first then copy back to the right partition on your MyBook. Works faster. At least that will up and down per USB to local disk, at possibly 12-14mbps, then send back at same speed. If you do that way it's like up-down-up-down, which really cuts the speed.

Hope this helps...
Click to expand...

Thanks for the tip :)
 
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