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Author Topic: Restore/recover from inaccessible USB HDD mount?  (Read 3535 times)

andwan0

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Restore/recover from inaccessible USB HDD mount?
« on: May 21, 2015, 06:22:06 AM »
I have a FAT32 USB HDD connected to my NAS.

If I accidently copy a file over 4.3GB then it crashes.
The USB mount becomes unaccessible.

How do I restore?
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FurryNutz

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Re: Restore/recover from inaccessible USB HDD mount?
« Reply #1 on: May 21, 2015, 07:28:41 AM »
FAT32 is limited to 4Gb file sizes. If you re-format the USB drive to use NTFS, then you can avoid the crashed problem.
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Cable: 1Gb/50Mb>NetGear CM1200>DIR-882>HP 24pt Gb Switch. COVR-1202/2202/3902,DIR-2660/80,3xDGL-4500s,DIR-LX1870,857,835,827,815,890L,880L,868L,836L,810L,685,657,3x655s,645,628,601,DNR-202L,DNS-345,DCS-933L,936L,960L and 8000LH.

andwan0

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Re: Restore/recover from inaccessible USB HDD mount?
« Reply #2 on: May 21, 2015, 07:50:19 AM »
Quote from: FurryNutz on May 21, 2015, 07:28:41 AM
FAT32 is limited to 4Gb file sizes. If you re-format the USB drive to use NTFS, then you can avoid the crashed problem.

No no no, transmission & NTFS is a no no... I have another USB HDD on NTFS and it's so slow with transmission on my NAS. I even searched the forums and everyone else reported the same problems.
FAT32 seems fine for speed wise.
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FurryNutz

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Re: Restore/recover from inaccessible USB HDD mount?
« Reply #3 on: May 21, 2015, 07:52:25 AM »
You will need to make sure that the data doesn't exceed 4Gb then. Is the drive crashing or is the DNS crashing?
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Cable: 1Gb/50Mb>NetGear CM1200>DIR-882>HP 24pt Gb Switch. COVR-1202/2202/3902,DIR-2660/80,3xDGL-4500s,DIR-LX1870,857,835,827,815,890L,880L,868L,836L,810L,685,657,3x655s,645,628,601,DNR-202L,DNS-345,DCS-933L,936L,960L and 8000LH.

ivan

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Re: Restore/recover from inaccessible USB HDD mount?
« Reply #4 on: May 21, 2015, 02:02:55 PM »
As FurryNutz says, on a FAT32 formatted partition you are limited to files less than 4GB which means there is no way you can copy full DVDs to such a drive.

In your case where you try to copy a file larger than 4GB it will copy the first 4GB then try to copy the remainder but the file system will not accept it therefore the crash.  It is even possible to crash the NAS in that condition depending on how much larger than 4GB the file is.  At 4.3GB you are on the borderline and I hope you have a tested backup of your NAS should there be a kernel panic type crash that damages the file structure.

Regarding your slow NTFS USB hard drive, is it a USB 1.1 or 2?  USB1.1 will be very slow on the NAS (as will a USB3 for some reason, at least here they are).
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