[SOLVED] USB drive reduced to 1.8g from 8g after using DD command.

Monk Tea · 09-20-2014, 05:17 PM

Hi.

I used a dd command to write and iso image of some distro having 1.8g iso image onto 8gb pendrive. And it worked but I didn't notice that the pen drive now only shows 1.8gb.

Here are the messages from the command line:

Code:

root@her:~# fdisk -l

Disk /dev/sda: 160.0 GB, 160041885696 bytes
255 heads, 63 sectors/track, 19457 cylinders, total 312581808 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: 0xc2966b58

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *          63    40001849    20000893+  83  Linux
/dev/sda2        40001850   312581807   136289979    5  Extended
/dev/sda5        40001913    48002219     4000153+  82  Linux swap
/dev/sda6        48002283   312581807   132289762+  83  Linux

Disk /dev/sdb: 8004 MB, 8004304896 bytes
247 heads, 62 sectors/track, 1020 cylinders, total 15633408 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: 0x00000000

   Device Boot      Start         End      Blocks   Id  System

dmesg shows this:

Code:

[    9.114912] usb 1-1.4: Product: Cruzer Blade
[    9.125232] usb 1-1.4: Manufacturer: SanDisk
[    9.135204] usb 1-1.4: SerialNumber: 20054963931175A206C1
[    9.170178] usb-storage 1-1.4:1.0: USB Mass Storage device detected
[    9.180131] scsi8 : usb-storage 1-1.4:1.0
[    9.189680] usbcore: registered new interface driver usb-storage
[    9.201031] hidraw: raw HID events driver (C) Jiri Kosina
[    9.247017] usbcore: registered new interface driver usbhid
[    9.256465] usbhid: USB HID core driver

gdisk shows this:

Code:

root@her:~# gdisk /dev/sdb
GPT fdisk (gdisk) version 0.8.7

Partition table scan:
  MBR: MBR only
  BSD: not present
  APM: not present
  GPT: not present


***************************************************************
Found invalid GPT and valid MBR; converting MBR to GPT format
in memory. THIS OPERATION IS POTENTIALLY DESTRUCTIVE! Exit by
typing 'q' if you don't want to convert your MBR partitions
to GPT format!
***************************************************************


Command (? for help):

Please tell me if I need to run more commands for troubleshooting.

Thanks.

metaschima · 09-20-2014, 05:21 PM

Quote:

Disk /dev/sdb: 8004 MB, 8004304896 bytes

That doesn't look like 1.8 GB to me.

linuxtinker · 09-20-2014, 05:25 PM

you wrote a 1.8gb table on a 8gb pen when you used the dd command...( I assume) .. What was the command you entered...

Monk Tea · 09-20-2014, 05:26 PM

Hi.

Yeah. I noticed that just now. Just too hung up after too much troubleshooting. I ran gdisk and that solved it. Using dd deleted the GPT I guess. Its fine now.

Sorry for the trouble.

fatmac · 09-21-2014, 04:58 AM

Just for interest, when using 'dd' you copy an 'image' of a drive, not files, so your drive will appear to have that capacity if you 'ls' its contents, but the drive itself is still whatever it was.