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Copying speed question
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Senior User
Join Date: May 2001
Status:
Offline
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I'm copying data from one hardrive to another.
It started at 18mb/ s
and stayed there a long time.
Today I woke up and it's still not done -- it's now at 13/mb s
Why would it get slower?
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OS 10.6.8
imac-2 core 27"/2009
4GB Ram
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Administrator  Join Date: Apr 2001
Location: San Antonio TX USA
Status:
Offline
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Maybe errors detected along the way and it's having to retry a lot? Plus with the lower speed later, it could be having to retrieve data from more widely dispersed fragments, which slow the transfer a lot.
How much data are you transferring and what kind of data is it?
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Glenn -----
OTR/L, MOT, Tx
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Moderator  Join Date: Aug 2001
Location: This is not my beautiful house
Status:
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And what type of connection are you using?
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Addicted to MacNN
Join Date: Jun 1999
Location: Las Vegas, NV, USA
Status:
Offline
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Plus, the data rate is an average over time. I think you're well within the normal ballpark.
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Senior User
Join Date: May 2001
Status:
Offline
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thanks guys, I'll go with that. I'm copying almost 2 TB of general data, files, photos etc.
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OS 10.6.8
imac-2 core 27"/2009
4GB Ram
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Grizzled Veteran
Join Date: Oct 2008
Location: UKland
Status:
Offline
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I have to say, copying 2TB of data should really be done by the time you wake up, unless you're using USB 1
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Mac Elite
Join Date: Mar 2003
Location: Virginia
Status:
Offline
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If you copy large files your throughput will be much higher than if you copy many smaller files.
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Senior User
Join Date: May 2001
Status:
Offline
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Doc, well I'm using USB 2
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OS 10.6.8
imac-2 core 27"/2009
4GB Ram
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Addicted to MacNN
Join Date: Jun 1999
Location: Las Vegas, NV, USA
Status:
Offline
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I use USB 2 for backups and i average about 15MB/s. It was disappointing at first.
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Senior User
Join Date: May 2001
Status:
Offline
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I have no idea what is good or bad. What is good?
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OS 10.6.8
imac-2 core 27"/2009
4GB Ram
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Administrator Join Date: May 2000
Location: California
Status:
Offline
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FireWire is good. eSATA is real good. Enclosures with Oxford Semiconductor interface chips are good.
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Forum Regular
Join Date: Aug 2005
Status:
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Originally Posted by jeff k 
I have no idea what is good or bad. What is good?
I recently copied a 160 GB (Gigabyte) iPhoto library from an internal drive on an iMac Intel Mac via Firewire 800 and it took about 1.5 hours. That is roughly 35 MB/s (MB = Megabyte). USB 2 can be ~ twice slower (or worse) than Firewire 800, so 13-18 MB/s would be not unusual.
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iMac Intel Core 2 Duo 2.66 GHz, 4 Gig RAM, 10.6.8
Macbook Pro Intel Core 2 Duo 3.06 GHz, 4 GB RAM, 10.6.8
iMac G5 2GHz, 1.5 GB RAM, 10.5.8
Macbook Air Core 2 Duo 4 Gig RAM, 10.6.8
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