Troubleshooting pendrive ext2fs
Casimiro de Almeida Barreto
casimiro.barreto at gmail.com
Tue Aug 18 22:10:26 UTC 2009
Hello,
I've trouble creating an ext2/ext3/ext4 file system in a 64GBytes pendrive.
The device appears at /proc/bus/usb/devices as:
T: Bus=01 Lev=01 Prnt=01 Port=04 Cnt=01 Dev#= 4 Spd=480 MxCh= 0
D: Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1
P: Vendor=1043 ProdID=8012 Rev= 1.00
S: Manufacturer=Generic
S: Product=Flash Disk
C:* #Ifs= 1 Cfg#= 1 Atr=80 MxPwr=100mA
I:* If#= 0 Alt= 0 #EPs= 2 Cls=08(stor.) Sub=06 Prot=50 Driver=usb-storage
E: Ad=81(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=02(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
It's partioned as:
Disk /dev/sdd: 67.1 GB, 67108864512 bytes
64 heads, 32 sectors/track, 64000 cylinders
Units = cilindros of 2048 * 512 = 1048576 bytes
Disk identifier: 0x4a26a3ed
Dispositivo Boot Start End Blocks Id System
/dev/sdd1 1 64000 65535984 83 Linux
And raw partition table data is:
Disk /dev/sdd: 64 heads, 32 sectors, 64000 cylinders
Nr AF Hd Sec Cyl Hd Sec Cyl Start Size ID
1 00 1 1 0 63 32 1023 32 131071968 83
2 00 0 0 0 0 0 0 0 0 00
3 00 0 0 0 0 0 0 0 0 00
4 00 0 0 0 0 0 0 0 0 00
Disk was formatted with the following command:
[root at localhost ~]# mkfs.ext2 -L kingston -M /media/kingston -O
large_file,extent /dev/sdd1
mke2fs 1.41.4 (27-Jan-2009)
Filesystem label=kingston
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
4096000 inodes, 16383996 blocks
819199 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=0
500 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208,
4096000, 7962624, 11239424
Writing inode tables: done
Writing superblocks and filesystem accounting information: done
This filesystem will be automatically checked every 33 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.
And then checked:
# fsck -f -v /dev/sdd1
Resulting in:
[root at localhost ~]# fsck -v -f /dev/sdd1
fsck 1.41.4 (27-Jan-2009)
e2fsck 1.41.4 (27-Jan-2009)
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
Block bitmap differences: +(32768--34306) +(65536--66049)
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Fix<y>?
If I fsck without -f, /dev/sdd1 will not be checked (it's marked as
clean)...
Then, if I ignore the errors, mount /dev/sdd1 at /media/kingston and do:
# PREFIX=/media/kingston/`date +%y%m%d%H%M`
# tar cjPf - /home /opt /usr/local | gpg -c -a -z0 --cipher-algo=aes256
-o ${PREFIX}.asc
It will create the backup file.
But, if I try:
# md5sum ${PREFIX}.asc > ${PREFIX}.md5
it will complain that "cannot write to device"...
I checked the device with:
# badblocks -w -v /dev/sdd1 and it went through without finding errors.
What's going wild with this particular device???
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