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03-23-2017, 12:59 PM
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#1
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Member
Registered: Jul 2014
Location: India
Distribution: CentOS
Posts: 75
Rep: 
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USB not detecting
I have created the bootable USB using command
Code:
dd if=FILE NAME HERE.iso of=/dev/sdb bs=1MB
I wanted to remove all the files present there but they become read only.
I tried to run
Code:
dd if=/dev/zero of=/dev/sdb bs=512 count=1
But it didn't worked. After searching through out the internet, I found the command to remove the read only & remove all the files from the USB.
Code:
sudo hdparm -r0 /dev/sdb
But now after ejecting the USB & again plugging in, it is not even detecting the USB.
After running the command
I got
Code:
Disk /dev/ram0: 64 MiB, 67108864 bytes, 131072 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk /dev/ram1: 64 MiB, 67108864 bytes, 131072 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk /dev/ram2: 64 MiB, 67108864 bytes, 131072 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk /dev/ram3: 64 MiB, 67108864 bytes, 131072 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk /dev/ram4: 64 MiB, 67108864 bytes, 131072 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk /dev/ram5: 64 MiB, 67108864 bytes, 131072 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk /dev/ram6: 64 MiB, 67108864 bytes, 131072 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk /dev/ram7: 64 MiB, 67108864 bytes, 131072 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk /dev/ram8: 64 MiB, 67108864 bytes, 131072 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk /dev/ram9: 64 MiB, 67108864 bytes, 131072 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk /dev/ram10: 64 MiB, 67108864 bytes, 131072 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk /dev/ram11: 64 MiB, 67108864 bytes, 131072 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk /dev/ram12: 64 MiB, 67108864 bytes, 131072 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk /dev/ram13: 64 MiB, 67108864 bytes, 131072 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk /dev/ram14: 64 MiB, 67108864 bytes, 131072 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk /dev/ram15: 64 MiB, 67108864 bytes, 131072 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk /dev/sda: 931.5 GiB, 1000204886016 bytes, 1953525168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: 3F801004-655B-4485-A2D9-95FDB1B8D6BA
Device Start End Sectors Size Type
/dev/sda1 2048 159999999 159997952 76.3G Linux filesystem
/dev/sda2 160000000 176001023 16001024 7.6G Linux swap
/dev/sda3 176001024 1953523711 1777522688 847.6G Linux filesystem
Disk /dev/sdb: 14.3 GiB, 15376000000 bytes, 30031250 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
How can I remove all the files from the usb?
Thanks
Last edited by Harshit_24; 03-23-2017 at 01:00 PM.
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03-23-2017, 01:16 PM
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#2
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Moderator
Registered: Mar 2011
Location: USA
Distribution: MINT Debian, Angstrom, SUSE, Ubuntu, Debian
Posts: 9,939
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Always use sudo with the dd command.
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03-23-2017, 03:40 PM
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#3
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Senior Member
Registered: Nov 2011
Location: London, UK
Distribution: Debian
Posts: 1,950
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Quote:
Originally Posted by Harshit_24
Code:
Disk /dev/sdb: 14.3 GiB, 15376000000 bytes, 30031250 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
How can I remove all the files from the usb?
Thanks |
What files?
should give information of interest connected with the recent detection of the USB device. |
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03-24-2017, 10:14 AM
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#4
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Member
Registered: May 2011
Location: Texas
Distribution: Debian/Ubuntu,CentOS
Posts: 848
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if you remove the usb drive and run fdisk -l again, does /dev/sdb go away?
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03-24-2017, 11:35 AM
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#5
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Member
Registered: Jul 2014
Location: India
Distribution: CentOS
Posts: 75
Original Poster
Rep:
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Quote:
Originally Posted by JeremyBoden
What files?
should give information of interest connected with the recent detection of the USB device. |
I had created the bootable USB for CENTOS. I want to remove those files present in the USB.
Below is the output of the above command.
Code:
[ 545.306054] scsi host2: usb-storage 1-3:1.0
[ 545.306174] usbcore: registered new interface driver usb-storage
[ 545.319166] usbcore: registered new interface driver uas
[ 546.307118] scsi 2:0:0:0: Direct-Access SanDisk Ultra 1.00 PQ: 0 ANSI: 6
[ 546.308825] sd 2:0:0:0: Attached scsi generic sg2 type 0
[ 546.310188] sd 2:0:0:0: [sdb] 30031250 512-byte logical blocks: (15.4 GB/14.3 GiB)
[ 546.311609] sd 2:0:0:0: [sdb] Write Protect is off
[ 546.311628] sd 2:0:0:0: [sdb] Mode Sense: 43 00 00 00
[ 546.312012] sd 2:0:0:0: [sdb] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA
[ 546.330395] sd 2:0:0:0: [sdb] Attached SCSI removable disk
Quote:
Originally Posted by erik2282
if you remove the usb drive and run fdisk -l again, does /dev/sdb go away?
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Yes, it doesn't shows then. |
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