Removable USB device contents cached after removal?
On Wed, Dec 31, 2003 at 05:12:16PM -0700, Matthew Mastracci wrote:
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1. Insert card into reader.
2. Mount card as directory somewhere in root filesystem, list contents of card
3. dd if=/dev/sdd1 count=1024 bs=1024 | hexdump
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- results in correct filesystem dump
4. Remove card from reader.
5. dd if=/dev/sdd1 count=1024 bs=1024 | hexdump
- same filesystem dump as before!
6. cd to mountpoint, contents are still available
7. dd if=/dev/sdd1 of=/dev/null
- approx 3MB of card data still available
8. umount the mountpoint from before
Did you try eject sdd after this, and if not, try, and see how it works.
Quoted 1 line
9. dd if=/dev/sdd1 of=/dev/null results in "No medium found"
usb-storage behaves differently in 2.6 than in 2.4, maybe this is the problem for you now.
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[email protected], IRC:*@Martin, /bin/zsh. C|N>K Linux moria 2.6.0-mm2 #1 Tue Dec 30 10:21:33 CET 2003 i686 12:46:44 up 1 day, 23:08, 11 users, load average: 0.94, 0.68, 0.69 UNIX programmers DO IT with forks.
USB Digital Camera mount problem [WAS: Removable USB device contents cached after removal?]
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Quoted 4 lines · Vid Strpic
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9. dd if=/dev/sdd1 of=/dev/null results in "No medium found"
usb-storage behaves differently in 2.6 than in 2.4, maybe this is the problem for you now.
I get "No medium found" when I try to mount the SD card inside my digital camera (Panasonic DMC-LC33.) It works fine in 2.4.18 that comes with Debian, but I get the above message in 2.6.0 (and couple of releases before it - it is a fairly new camera, ~2 months old.)
Any ideas how to debug it?
Jeff.
When plugged in:
kernel: hub 2-2:1.0: new USB device on port 4, assigned address 3 kernel: Initializing USB Mass Storage driver... kernel: scsi1 : SCSI emulation for USB Mass Storage devices kernel: Vendor: MATSHITA Model: DMC-LC33 Rev: 0100 kernel: Type: Direct-Access ANSI SCSI revision: 02 kernel: SCSI device sda: 246017 512-byte hdwr sectors (126 MB) kernel: sda: Write Protect is off kernel: sda: Mode Sense: 00 06 00 00 kernel: sda: assuming drive cache: write through kernel: sda: sda1 kernel: Attached scsi removable disk sda at scsi1, channel 0, id 0, lun 0 kernel: Attached scsi generic sg0 at scsi1, channel 0, id 0, lun 0, type 0 kernel: WARNING: USB Mass Storage data integrity not assured kernel: USB Mass Storage device found at 3 kernel: drivers/usb/core/usb.c: registered new driver usb-storage kernel: USB Mass Storage support registered.
scsi.agent[22366]: disk at /devices/pci0000:00/0000:00:1f.4/ usb2/2-2/2-2.4/2-2.4:1.0/host1/1:0:0:0
When I try to mount it, mount refuses, but there are no log messages:
jeff:~# mount /dev/sda1 /mnt/camera/ mount: No medium found jeff:~#
And when I shut the camera off, I get:
kernel: usb 2-2.4: USB disconnect, address 3
The modules:
jeff:~# lsmod Module Size Used by usb_storage 34688 0 nvidia 1704492 10 tvaudio 21888 0 msp3400 22928 0 bttv 140704 1 video_buf 22400 1 bttv i2c_algo_bit 10248 1 bttv btcx_risc 5252 1 bttv v4l2_common 5376 1 bttv videodev 10368 2 bttv uhci_hcd 31240 0 usbcore 109012 4 usb_storage,uhci_hcd evdev 10496 0 tuner 15108 0 i2c_core 24964 5 tvaudio,msp3400,bttv,i2c_algo_bit,tuner eepro100 31244 0 mii 5632 1 eepro100
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