Read Only USB
We nemen een USB stick in gebruik. Gekregen, een reclame ding. Plug
deze in en zien twee partities auto mounten. Niet sdc1 en sdc2, maar
sdc1 en sdd1. He, wat leuk, is dat nieuw, naief als ik ben. Misschien is
het in mijn case ook wel handig. Ze hebben deze indeling gemaakt.
# fdisk /dev/sdc /dev/sdd -l
Disk /dev/sdc: 75 MB, 75759616 bytes
16 heads, 34 sectors/track, 272 cylinders, total 147968 sectors
Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical):
512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xc3072e18
Device Boot Start End Blocks Id System
/dev/sdc1 * 191 147455 73632+ 6 FAT16
Disk /dev/sdd: 446 MB, 446693376 bytes
2 heads, 63 sectors/track, 6924 cylinders, total 872448 sectors
Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical):
512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000a9394
Device Boot Start End Blocks Id System
/dev/sdd1 * 32 872447 436208 6 FAT16
Zie de heads, sectors & cylinders indeling. Prima denk ik nog, so be it.
# tail -n60 syslog
kernel: [ 1788.429589] usb 1-4: USB disconnect, device number 5
kernel: [ 1793.232027] usb 1-4: new high-speed USB device number 6 using
ehci-pci
kernel: [ 1793.998772] usb 1-4: New USB device found, idVendor=090c,
idProduct=1000
kernel: [ 1793.998779] usb 1-4: New USB device strings: Mfr=1,
Product=2, SerialNumber=3
kernel: [ 1793.998784] usb 1-4: Product: USB DISK
kernel: [ 1793.998788] usb 1-4: Manufacturer: SMI Corporation
kernel: [ 1793.998792] usb 1-4: SerialNumber: AA000000000000000025
kernel: [ 1793.999479] scsi7 : usb-storage 1-4:1.0
mtp-probe: checking bus 1, device 6:
"/sys/devices/pci0000:00/0000:00:1d.7/usb1/1-4"
mtp-probe: bus: 1, device: 6 was not an MTP device
kernel: [ 1794.997516] scsi 7:0:0:0: Direct-Access SMI USB DISK 1100 PQ:
0 ANSI: 0 CCS
kernel: [ 1794.998753] scsi 7:0:0:1: Direct-Access SMI USB DISK 1100 PQ:
0 ANSI: 0 CCS
kernel: [ 1794.999825] sd 7:0:0:0: Attached scsi generic sg4 type 0
kernel: [ 1795.000895] sd 7:0:0:1: Attached scsi generic sg5 type 0
kernel: [ 1795.009729] sd 7:0:0:0: [sdc] 147968 512-byte logical blocks:
(75.7 MB/72.2 MiB)
kernel: [ 1795.010384] sd 7:0:0:1: [sdd] 872448 512-byte logical blocks:
(446 MB/426 MiB)
kernel: [ 1795.011529] sd 7:0:0:0: [sdc] Write Protect is on
kernel: [ 1795.011539] sd 7:0:0:0: [sdc] Mode Sense: 43 00 80 00
kernel: [ 1795.012759] sd 7:0:0:1: [sdd] Write Protect is off
kernel: [ 1795.012767] sd 7:0:0:1: [sdd] Mode Sense: 43 00 00 00
Ik list dit omdat sdc1 blijkt 'Write Protect is on' te zijn. En 'Mode
Sense: 43 00 80 00'. Okay, dat passen we even met aan.
# hdparm -r0 /dev/sdc1
/dev/sdc1:
setting readonly to 0 (off)
readonly = 0 (off)
# mkfs.vfat /dev/sdc1
mkfs.vfat 3.0.14 (23 Jan 2023)
mkfs.vfat: unable to open /dev/sdc1: Read-only file system
Jammer. Nu is de vraag, hoe los je dat op? Zie ik wat over het hoofd?
Met vrinedelijke groet,
Frans van Berckel
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