[Solved]USB Flash Drive inaccessible.

Hi there.
I have installed Arch Linux on my Sony laptop and I have configured it so that most stuff works. The only problem I'm facing now, is that my USB Flash Drive won't show up when I plug it in. I have tried restarting ehci service, but it does not solve anything. I had this problem many years ago with another computer running Linux, but I can't remember how it got solved. Connecting a USB-mouse works perfectly but not a flash drive. The drive is a FAT32 formatted Kingston.
This is my dmesg log:
[ 109.300651] usb 2-1.3: new high-speed USB device number 4 using ehci_hcd
[ 109.613294] Initializing USB Mass Storage driver...
[ 109.613459] scsi7 : usb-storage 2-1.3:1.0
[ 109.613577] usbcore: registered new interface driver usb-storage
[ 109.613579] USB Mass Storage support registered.
[ 110.614456] scsi 7:0:0:0: Direct-Access Generic Flash Disk 8.07 PQ: 0 ANSI: 2
[ 110.616674] sd 7:0:0:0: [sdc] 8237056 512-byte logical blocks: (4.21 GB/3.92 GiB)
[ 110.617821] sd 7:0:0:0: [sdc] Write Protect is off
[ 110.617835] sd 7:0:0:0: [sdc] Mode Sense: 03 00 00 00
[ 110.618550] sd 7:0:0:0: [sdc] No Caching mode page present
[ 110.618561] sd 7:0:0:0: [sdc] Assuming drive cache: write through
[ 110.621899] sd 7:0:0:0: [sdc] No Caching mode page present
[ 110.621908] sd 7:0:0:0: [sdc] Assuming drive cache: write through
[ 110.787723] sdc: sdc1
[ 110.880634] sd 7:0:0:0: [sdc] No Caching mode page present
[ 110.880647] sd 7:0:0:0: [sdc] Assuming drive cache: write through
[ 110.880655] sd 7:0:0:0: [sdc] Attached SCSI removable disk
Running openbox with PCManFM. Any clues how to solve this?
Last edited by light (2013-03-17 21:26:26)

s1ln7m4s7r wrote:
For what i can see from the log there is no problem.
Have you tried to manually mount it? To see if it is a PCManFM issue. Also, have you checked this:
https://wiki.archlinux.org/index.php/PC … ge_devices
Hi.
I tried installing gvfs, apparently I uninstalled it for some reason before. But it did not help mounting the flash drive. So I tried mounting it manually and it worked (Yaay!). But it complained that my flash drive was not mentioned in fstab. So I looked in fstab and the only ones listed is my root partion "/" and "/home". So how do I add USB mounting to fstab? I'm a little bit confused.
And one off-topic question: Shouldn't my "/var" partion also be mentioned in fstab?
Thanks for helping me
Edit: This is how fstab looks right now
# /etc/fstab: static file system information
# <file system> <dir> <type> <options> <dump> <pass>
# /dev/sda2 LABEL=/
UUID=ed07bdb6-61c6-4cc7-b98d-122a869046f1 / ext4 rw,relatime,data=ordered 0 1
# /dev/sda4 LABEL=/home
UUID=7448100b-682b-430f-9e59-327ce6f9f22c /home ext4 rw,relatime,data=ordered 0 2
Last edited by light (2013-03-17 20:54:38)

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Sparkles1
I work on behalf of HP
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How can I solve this problem?
This error message does not happen everytime but rather occasionally. Most of the files I am trying to copy to my USB flash drives are MS Word documents. I have tried using various brands of flash drive, but I still get this error message.
I use my USB flash drives for both Mac and Windows OS computers. For my 2GB Kingston Data Traveller flash drive, I checked its product datasheet on the Kingston website, and it says that it is compatible with both Macintosh and Windows OS, and that I can use it for cross-platform PC/Mac file transfers.
I also checked the Properties tab for this flash drive, and the File System for the drive is listed as "FAT."

Hello Stedman:
I am pretty sure that these files were not open in MS Word when I tried to copy them.
I only get this error message/code for a handful of MS Word documents; the rest of my MS Word documents were copied successfully to my USB flash drive.

Unmounting USB flash drive from cRIO

Hi all,
I am using the USB port of a cRIO 9012 to save datafiles (using File I/O) to a USB flash drive.
After having run the program, I want to unmount the USB drive. Can anyone please tell me if there is a better/nicer way than just taking it out? Since this might result into losing my data if the USB drive gets corrupt (just like under Windows).
I have searched the forums, but I was not able to find anything on dismounting a USB drive on a cRIO...
Hopefully you can help me solving this (little) problem.
Thanks in advance,
Joep

Joep,
under Windows there are two scenarios that could cause data corruption on a USB-Flash-Drive:
The Flash-Drive is removed during a write operation. This potentially destroys the FAT which results in data loss. There is not much that you can do against this behavior, neither on Windows, nor under VxWorks.
With caching enabled for the Flash-Drive there is a chance that files are not written to the drive completely because some parts of it are still sitting in the PC's memory. When the drive gets removed the data is corrupt.
I don't think that VxWorks uses cache for mass storage devices at all so this issue shouldn't be relevant for a cRIO-9012, but I will double check if this is true.
Best regards,
Jochen Klier
National Instruments Germany

[Solved]USB Flash Drive inaccessible.

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