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 Post subject: File Transfer Corruption
PostPosted: Sun Feb 10, 2013 11:20 am 
Smithfield
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I have 2 external USB hard drives and it seems like I have a unidirectional corruption issue.

When I transfer a video file from drive A to drive B it will corrupt the file but not in the other direction. Video files that were originally on drive B play fine.

As a test I downloaded a few youtube videos to both drives and they play fine on either drive but they will corrupt if I do the above transfer.

I've tried changing the ports the drives are on but that doesn't change anything.

Any suggestions on what kind of tests I can run to see what the root of the problem is?


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 Post subject: Re: File Transfer Corruption
PostPosted: Sun Feb 10, 2013 11:31 am 
Clawhammer
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Hmmm, this is a good one Satch. Lemme do some research.


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 Post subject: Re: File Transfer Corruption
PostPosted: Sun Feb 10, 2013 11:36 am 
Team Member Top 10
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how about if you switch the cables? rather than the ports.


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 Post subject: Re: File Transfer Corruption
PostPosted: Sun Feb 10, 2013 11:46 am 
Smithfield
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I'm going to rule out the cable as USB is half-duplex. Which means if it was the cable, both sides would have issues. So I will point at the drive B's USB controller. Unfortunately the only way to confirm this is to take out the hard drive from the external's enclosure, which will void any warranty on it.


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 Post subject: Re: File Transfer Corruption
PostPosted: Sun Feb 10, 2013 11:54 am 
Clawhammer
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Cables are indeed the culprit here. USB2 running in "hi-speed" can theoretically do about 60MBps max (ie 480Mbps), but you'll never get that. If you are using both drives on the same USB hub, then you are sharing that available bandwidth between the devices. So at theoretical best (with both drives being accessed) you'd probably only get like 30MBps to each drive. After adding overhead and real-world physics to the mix, then getting ~15MBps sustained sounds about right. You're going to want to get that 2nd drive onto a different USB hub, or hooked up via Firewire, eSATA to get it onto a different data bus.


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 Post subject: Re: File Transfer Corruption
PostPosted: Sun Feb 10, 2013 12:25 pm 
Smithfield
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I swapped in a new cable for drive B and it's still corrupting files but not as many.


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 Post subject: Re: File Transfer Corruption
PostPosted: Sun Feb 10, 2013 12:27 pm 
Smithfield
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Satchboy wrote:
I swapped in a new cable for drive B and it's still corrupting files but not as many.

So... Let's make sure the hard drive itself is okay. Pry open that bad boy and hook it up the computer directly!


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 Post subject: Re: File Transfer Corruption
PostPosted: Sun Feb 10, 2013 12:38 pm 
Smithfield
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That's the next step but it looks like I might have to damage the housing in order to get to the drive since there are no visible screws or latches to open it up.


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 Post subject: Re: File Transfer Corruption
PostPosted: Mon Feb 11, 2013 1:24 pm 
Smithfield
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I internally mounted the drive and so far it seems to be working fine.

I was happy to see that it was a SATA drive and not an IDE. :D


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 Post subject: Re: File Transfer Corruption
PostPosted: Mon Feb 11, 2013 2:04 pm 
Smithfield
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Well, do a round of rigorous tests (diagnostic tools from the manufacturer maybe?) and once you're sure it's okay, treat yourself to an external enclosure.


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 Post subject: Re: File Transfer Corruption
PostPosted: Mon Feb 11, 2013 2:26 pm 
Smithfield
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I'm actually thinking of keeping this drive inside the computer. I still have the other USB drive for portability and it's bigger.

I've used scan disk on both drives before and it always came back with no errors so I think a faulty controller might be the issue.


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 Post subject: Re: File Transfer Corruption
PostPosted: Tue Feb 12, 2013 3:22 pm 
Bitchin' Fast 3D Z8000
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You're not hitting that 4 gig file limit on fat32 are you?


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 Post subject: Re: File Transfer Corruption
PostPosted: Tue Feb 12, 2013 3:50 pm 
Smithfield
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furball146 wrote:
You're not hitting that 4 gig file limit on fat32 are you?

The OS would complain you're doing this rather than corrupt the data.


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 Post subject: Re: File Transfer Corruption
PostPosted: Wed Feb 13, 2013 5:23 am 
Smithfield
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Fat32 is sooo 1999. ;)

All my drives are NTFS.

I still haven't had any issues after installing it internally so I think we can close this topic.

Thanks for all your input.


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