How do I clean my flash drive so there is absolutely nothing on it.

Discussion in 'macOS' started by giladdor, Jul 12, 2009.

  1. giladdor

    giladdor MDL Novice

    Jul 12, 2009
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    I have deleted everything on the drive, and it says that there is only 1.48GB left, on a 4GB flash drive.
     
  2. 911medic

    911medic MDL Guru

    Aug 13, 2008
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    491
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    View all files (hidden files) and delete .Trash folder..
     
    Stop hovering to collapse... Click to collapse... Hover to expand... Click to expand...
  3. shoarthing

    shoarthing MDL Novice

    Feb 20, 2008
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    . . . to completely blank a drive in OSX, go to Applications: Utilities: - then fire up Disk Utility

    Insert flash drive - Disk Utility will list it, both as a device & below that device list it as the device's partitioned/formatted volume

    Select the volume, then choose 'erase' - it will by default keep the name & filesystem you had before; but to be safe double-check to make sure it isn't formatting a FAT volume to HFS+ - it is probably all-in-all safest to keep flash drives as FAT unless you only work with Macs.


    . . post back if you have any hassles.
     
  4. duh

    duh MDL Member

    Jan 20, 2009
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    how? like this?

    one liner commands (conditions apply: number 1, duh is not responsible if you screw your hard drive; number 2, duh will not buy you one if you screw up ANYHOW; number 3, you need a linux live cd, there are countless live cd, if you dont have one, download it the smallest i.e. DSL (damn small linux) and/or make your own custom live cd, period) scroll down for one liner.

    HOWTO:
    (insert the usb stick and then in command prompt as root where shell shows # and not $) and in command prompt type
    # dmesg
    then look for pen drive it will be like sda1, sdb1, sdc1, sdd1
    i will name it as sdXY, where X=a-z and Y=1-16, unices and linux is case sensitive.
    now type this command
    # shred -zuxv -n 2 /dev/sda1
    and wait, explaination, it will wipe the data to maximum of 2 pass no known recovery method, NSA may blink unless some magnetotherapy is used, hey this is silicon, so i doubt. :-D
    now for the ultra paranoid? :-D
    # dd if=/dev/zero of=/dev/sda
    go finish your pizza and coke while it does it, on a 4 gb it will take 15-20 mins to blind 0 write format. data lost is GONE FOR A TOSS, so do a backup before.
    then?
    # fdisk -l /dev/sda
    to verify this is the disk and then?
    # fdisk /dev/sda
    then type
    p
    (p will print the partition value)
    then type
    n
    (n will create a new partition)
    type
    p
    (the second p is primary partition)
    type
    1
    (1 is the first partition)
    then hit enter twice
    then type
    a
    then type
    1
    (a and 1 will make partition 1 active)
    then type
    t
    (now if you want dos then type b else 6 else 7, where b is fat 32, 6 is fat 16 and 7 is ntfs)
    now finally type
    w
    and reboot to windows.


    BIGGGGGGGG FATTTTTTTTTTTT WARNINGGGGGGGGGGGG
    TYPE DMESG i.e. (dmesg) IN ROOT PROMPT AND FIND OUT WHICH IS THE DETECTED USB PEN DRIVE
    here is an example

    [ 4428.956041] usb 1-2: new high speed USB device using ehci_hcd and address 4
    [ 4429.090512] usb 1-2: configuration #1 chosen from 1 choice
    [ 4429.090946] scsi4 : SCSI emulation for USB Mass Storage devices
    [ 4429.091099] usb 1-2: New USB device found, idVendor=058f, idProduct=6387
    [ 4429.091102] usb 1-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
    [ 4429.091104] usb 1-2: Product: Mass Storage Device
    [ 4429.091106] usb 1-2: Manufacturer: JetFlash
    [ 4429.091107] usb 1-2: SerialNumber: LAWL NOT MY SERIAL ID NUMBERS
    [ 4429.091114] usb-storage: device found at 4
    [ 4429.091116] usb-storage: waiting for device to settle before scanning
    [ 4434.088200] usb-storage: device scan complete
    [ 4434.088886] scsi 4:0:0:0: Direct-Access JetFlash TS4GJFV30 8.07 PQ: 0 ANSI: 2
    [ 4434.098061] sd 4:0:0:0: [sdc] 7987200 512-byte hardware sectors (4089 MB)
    [ 4434.098689] sd 4:0:0:0: [sdc] Write Protect is off
    [ 4434.098695] sd 4:0:0:0: [sdc] Mode Sense: 03 00 00 00
    [ 4434.098697] sd 4:0:0:0: [sdc] Assuming drive cache: write through
    [ 4434.114430] sd 4:0:0:0: [sdc] 7987200 512-byte hardware sectors (4089 MB)
    [ 4434.115056] sd 4:0:0:0: [sdc] Write Protect is off
    [ 4434.115062] sd 4:0:0:0: [sdc] Mode Sense: 03 00 00 00
    [ 4434.115064] sd 4:0:0:0: [sdc] Assuming drive cache: write through
    [ 4434.115067] sdc: sdc1
    [ 4434.315006] sd 4:0:0:0: [sdc] Attached SCSI removable disk

    AS YOU SEE THE /dev/sdc1 IS THE PEN DRIVE WHICH IS ALSO 4 GB.


    to sum up all commands? THE ONE LINER I BEEN SPEAKING?
    tantanana!
    # shred -zuxv -n 2 /dev/sda; dd if=/dev/zero of=/dev/sda; parted /dev/sda "mklabel msdos mkpart primary 0.00 - set 1 boot on"; fdisk -l /dev/sda; reboot
    or
    echo "shred -zuxv -n 2 /dev/sda; dd if=/dev/zero of=/dev/sda; parted /dev/sda "mklabel msdos mkpart primary 0.00 - set 1 boot on"; fdisk -l /dev/sda; reboot" > delete-pen-usb.sh; chmod +x delete-pen-usb.sh; sh +x delete-usb-pen.sh

    -hth
    :D