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format a usb stick
Posted: 5. Oct 2015, 23:09
by jsfarinet
I've a problem with a usb stick i formatted long time ago as multiboot (under debian). Now,for some reason this stick is not recognized anymore.Not even by cfdisk, parted or gparted. 'udisks --enumerate shows it,on the other hand. I'm pretty it is broken softwarewise not hardwarewise
I tried to format it on a macintosh, but it did not show up there anyway (and i'm not really familiar with macos
).
Is there some tool, i could use to override the mbr and the corrupted boot sector, so that it will turn back formattable?
TIA!
Re: format a usb stick
Posted: 6. Oct 2015, 09:33
by gapan
Post the output of
before and after you insert the usb stick.
Also post the last lines of
after you insert the usb stick.
Re: format a usb stick
Posted: 6. Oct 2015, 10:50
by jsfarinet
only shows the internal hd (sda).
shows this:
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WARNING: GPT (GUID Partition Table) detected on '/dev/sdc'! The util fdisk doesn't support GPT. Use GNU Parted.
Platte /dev/sdc: 773 MByte, 773652480 Byte
15 Köpfe, 48 Sektoren/Spur, 2098 Zylinder, zusammen 1511040 Sektoren
Einheiten = Sektoren von 1 × 512 = 512 Bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000
Gerät boot. Anfang Ende Blöcke Id System
/dev/sdc1 * 63 1511039 755488+ 83 Linux
and then select /dev/sdc > print shows:
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Warnung: /dev/sdc enthält GPT-Signaturen, die anzeigen, dass es eine GPT-Tabelle
hat. Es ist jedoch keine gültige vorgetäuschte MSDOS-Partitionstabelle
vorhanden, die erforderlich wäre. Vielleicht wurde diese zerstört -- eventuell
durch ein Programm, das GPT-Partitionstabellen nicht versteht. Oder vielleicht
haben Sie die GPT-Tabelle gelöscht, und verwenden jetzt eine
MS-DOS-Partitions-Tabelle. Ist dies eine GPT-Partitionstabelle?
Ja/Yes/Nein/No? y
Modell: (file)
Festplatte /dev/sdc: 774MB
Sektorgröße (logisch/physisch): 512B/512B
Partitionstabelle: gpt
Disk Flags: pmbr_boot
Nummer Anfang Ende Größe Dateisystem Name Flags
1 2163kB 2969kB 806kB recover boot
If i reply no to the question if it is a gpt partition table the i get:
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Modell: (file)
Festplatte /dev/sdc: 774MB
Sektorgröße (logisch/physisch): 512B/512B
Partitionstabelle: unknown
Disk Flags:
sudo dmesg | grep usb
shows this:
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[22597.728391] usb 3-1: new high-speed USB device number 8 using ehci-pci
[22597.843649] usb 3-1: New USB device found, idVendor=048d, idProduct=1168
[22597.843658] usb 3-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[22597.845013] usb-storage 3-1:1.0: USB Mass Storage device detected
[22597.845143] scsi12 : usb-storage 3-1:1.0
It is a 16gig mistral made by CnMemory.
Re: format a usb stick
Posted: 6. Oct 2015, 10:57
by gapan
Try:
Code: Select all
sudo parted /dev/sdc
mklabel msdos
quit
What does
show then?
Oh, and it's generally a good idea to
when asking for help online. Not everyone understands german.
Re: format a usb stick
Posted: 6. Oct 2015, 12:17
by jsfarinet
Thanks for your patience. Where should i put the command to export in English?
In any case unfortunately the mklabel msdos command did not change anything. In fdisk -l the stick still does not show up. In fdisk /dev/sdc -l it shows up as before, i.e. in very distorted way ...
In gparted it does not show up at all. May be it's an idea to force a copy by using dd. And then, even if the copy went wrong may be i turns back to be formattable???
Re: format a usb stick
Posted: 6. Oct 2015, 12:30
by gapan
You can run the export command in the terminal, before you run anything else.
Anyway, you can overwrite the entire stick using dd:
That will certainly do it. You will probably have to remove it and replug it to see the changes. You will have to repartition and format it then.
Re: format a usb stick
Posted: 8. Oct 2015, 07:36
by jsfarinet
gapan wrote:You can run the export command in the terminal, before you run anything else.
Anyway, you can overwrite the entire stick using dd:
That will certainly do it. You will probably have to remove it and replug it to see the changes. You will have to repartition and format it then.
That changed something but still i do not see the stick in gparted. I also tried u3-tools but seems they're too old ... (?)
In any case thanks to you for your patience. May be you've another idea (???)
Re: format a usb stick
Posted: 8. Oct 2015, 08:25
by gapan
Post the output of
now.
And I'm quite sure that running
or
will allow you to partition it from scratch now.
Re: format a usb stick
Posted: 8. Oct 2015, 10:15
by jsfarinet
gapan wrote:Post the output of
now.
Code: Select all
Disk /dev/sda: 500.1 GB, 500107862016 bytes
255 Köpfe, 63 Sektoren/Spur, 60801 Zylinder, zusammen 976773168 Sektoren
Einheiten = Sektoren von 1 × 512 = 512 Bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x00073e7b
Gerät boot. Anfang Ende Blöcke Id System
/dev/sda1 * 63 58589054 29294496 83 Linux
Partition 1 does not start on physical sector boundary.
/dev/sda2 58589055 960927974 451169460 83 Linux
Partition 2 does not start on physical sector boundary.
/dev/sda3 960927975 976773167 7922596+ 82 Linux Swap
Partition 3 does not start on physical sector boundary.
gapan wrote:And I'm quite sure that running
Wenn i do this, eg. i create a primary table, bootable, ecc ecc. *IN* cfdisk the result looks like this:
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cfdisk (util-linux 2.21.2)
Festplatte: /dev/sdc
Größe: 3860926464 Bytes, 3860 MB
Köpfe: 102 Sektoren pro Spur: 24 Zylinder: 3080
Name Flags Part. Typ Dateisystemtyp [Bezeichner] Größe (MB)
------------------------------------------------------------------------------
Pri/Log Freier Bereich 0,04*
sdc1 Boot Primäre W95 FAT32 3860,90*
[ Hilfe ] [ Neue ] [ Ausgabe ] [ Ende ] [ Einheit. ]
[ Schreib. ]
but fdisk -l gives the same result as before :clueless:
gapan wrote:or
will allow you to partition it from scratch now.
It seems to work too, but to the same extend as cfdisk.
Note that in any case the given available content of the stick clearly is wrong: it *IS* defintely a 16G stick (and not 4G).
Thunar tries to mount it (and shows a device, but it's not accessable). When i try to eject, i get this error msg, which may says something to you:
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Error ejecting /dev/sdc: Command-line `eject "/dev/sdc"' exited with non-zero exit status 1: eject: tried to use `/dev/sdc' as device name but it is no block device
eject: tried to use `.//dev/sdc' as device name but it is no block device
eject: unable to find or open device for: `/dev/sdc'
Eventually, although i do not think so, is there something i could/should do in "etc/fstab" ?
Re: format a usb stick
Posted: 9. Oct 2015, 19:48
by maximus
jsfarinet wrote:
Eventually, although i do not think so, is there something i could/should do in "etc/fstab" ?
I don't think so either.
After all of this, can you see the stick at all in gparted now? I did come across a USB stick recently that was used as installation media for Ubuntu, and was formatted with GPT partitions. I was able to select the device in the drop-down menu in gparted, then choose
Device --> Create Partition Table from the main menu, which removed all details of the existing partitions, and let me then create a single partition which filled the whole drive.
To be honest, I think the advice you've already received should have fixed any problems related to a screwed up filesystem; I would certainly expect zeroing the drive using dd to have done so. Of course I may be wrong, but if you still can't access the drive now then I think you're looking at faulty hardware.