Fixing your usb drive
I have updated my Apple TV by using the patchstick on my usb flash drive. Now I need to use my usb drive to do a linux boot so I can do a network install of RedHat AS 4. I plugged in my usb drive to a SUSE 9 box I have and checked to see if it could see the device connected.
mikey:~ # view /proc/bus/usb/devices
T: Bus=04 Lev=01 Prnt=01 Port=02 Cnt=01 Dev#= 2 Spd=480 MxCh= 0
D: Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1
P: Vendor=14af ProdID=af01 Rev=11.00
S: Manufacturer=SAMSUNG
S: Product=SAMSUNG SUM-2G
S: SerialNumber=0190107060001334
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=31875us
My machine sees the device but if I try and mount it.
mikey:~ # mkdir /mnt/usb
mikey:~ # mount -t vfat /dev/sda1 /mnt/usb/
mount: /dev/sda1 is not a valid block device
Now lets see what fdisk says.
mikey:~ # fdisk -l
Disk /dev/hda: 80.0 GB, 80032038912 bytes
255 heads, 63 sectors/track, 9730 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/hda1 1 131 1052226 82 Linux swap
/dev/hda2 132 9729 77095935 83 Linux
Disk /dev/sda: 2030 MB, 2030043136 bytes
255 heads, 63 sectors/track, 246 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sda1 1 247 1982463+ ee EFI GPT
Partition 1 has different physical/logical beginnings (non-Linux?):
phys=(1023, 254, 63) logical=(0, 0, 2)
Partition 1 has different physical/logical endings:
phys=(1023, 254, 63) logical=(246, 205, 23)
The problem is the first (non-Linux?) physical partition. To fix it I need to delete the partitions and recreate them. Now I know my device isn’t mounted but just to make sure.
mikey:~ # umount /dev/sda1
umount: /dev/sda1: not mounted
mikey:~ # fdisk /dev/sda
Command (m for help): d
Selected partition 1
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-246, default 1): 1
Last cylinder or +size or +sizeM or +sizeK (1-246, default 246): +750M
Command (m for help): a
Partition number (1-4): 1
Command (m for help): t
Selected partition 1
Hex code (type L to list codes): 6
Changed system type of partition 1 to 6 (FAT16)
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 2
First cylinder (93-246, default 93):
Using default value 93
Last cylinder or +size or +sizeM or +sizeK (93-246, default 246):
Using default value 246
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
WARNING: If you have created or modified any DOS 6.x
partitions, please see the fdisk manual page for additional
information.
Syncing disks.
mikey:~ # mkfs.vfat -F 16 -n rhboot /dev/sda1
mkfs.vfat 2.10 (22 Sep 2003)
mikey:~ # mkfs.ext2 -b 4096 -L casper -rw /dev/sdb2
mke2fs 1.38 (30-Jun-2005)
Filesystem label=casper
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
154880 inodes, 309251 blocks
15462 blocks (5.00%) reserved for the super user
First data block=0
10 block groups
32768 blocks per group, 32768 fragments per group
15488 inodes per group
Superblock backups stored on blocks:
32768, 65536, 98304, 131072, 163840, 196608, 229376, 262144, 294912
Writing inode tables: done
Writing superblocks and filesystem accounting information: done
This filesystem will be automatically checked every 32 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.
mikey:~ # mount /dev/sda1 /mnt/usb/
mikey:~ # dd if=/root/diskboot.img of=/dev/sda1
12288+0 records in
12288+0 records out
mikey:~ # fdisk /dev/sda
Command (m for help): p
Disk /dev/sda: 2030 MB, 2030043136 bytes
255 heads, 63 sectors/track, 246 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sda1 * 1 92 738958+ 6 FAT16
/dev/sda2 93 246 1237005 83 Linux
Now windows and Linux can read/write to my flash drive.
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