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why a usb drive can work in both linux os and windows os without the need for formating the file system?
Typically USB drives are formatted with FAT32 or NTFS, both of which are usable in Linux.
You might also find the Wikipedia article on USB mass storage devices interesting. In particular:
The USB mass storage specification
does not require any particular file
system to be used on conforming
devices. Instead, it provides a simple
interface to read and write sectors of
data—much like the low-level interface
used to access any hard drive—using
the "SCSI transparent command set."
Operating systems may treat the USB
drive like a hard drive, and can
format it with any file system they
like.
Because both OS'es know how to read/parse/work with the format.
Format a USB key in say OSXs HFS+ and then windows will not know which end is up (without third party drivers)
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My laptop used to come with windows 10, but then I decided to install ubuntu on it instead. Now I would like to install windows 10. Is there way to get windows 10 back?
First you will need a bootable USB - a USB flash drive that has at least 16GB of space (there are free programs that you will find available on internet to make the USB bootable), download Windows 10 ISO file and add to the USB.
Alter the BIOS sequence on your PC so your USB device is first. In most instances, the BIOS will usually not be automatically set to your device. If you skip this step, your computer will start regularly from your hard drive instead of getting boot information from your USB device, then follow the steps to install the windows OS.
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I am trying to save some important files from my faulty internal hard drive on my iMac. I am in the Internet Recovery mode and running the terminal. I also have connected an external 1TB storage and I can view the files inside it using the terminal. However, I cannot seem to write anything on the external drive as I get the message
cp: volumes/seagatedrive/backup.dmg: Read-only file system
I have used the chmod 777 command for my seagatedrive to no avail. The message I get there is:
Unable to change file mode on volumes/seagatedrive: Read-only file
system
How can I make my external hard drive (seagatedrive above) writable?
Would appreciate any help.
UPDATE
OP has stated, that his drive is formatted as NTFS. therefore you'll need to setup thirdparty drivers to support write-access on that drive.
An article about that can be found here:
http://www.howtogeek.com/236055/how-to-write-to-ntfs-drives-on-a-mac/
[...]
Mac OS X can read from NTFS drives, but it can’t write to them unless you use one of the below tricks. We highly recommend paying for a third-party NTFS driver if you need to do this as the other solutions don’t work as well and are more work to set up.[...]
Alternatively you should consider using exFAT as drive Format. Using
exFAT has the advantage of compatibility on almost all Platforms.
Since I can't put my thoughts in a comment (not enough rep. yet) here is what you can check.
osx behaves strangely with external drives which aren't formatted in Mac OS Format.
check volume's partition-type
check mount tab (if exists)
make shure that your drive isn't write-protected.
if this all fails you could also check, if root has the proper rights to do these previous things.
if so, there might be a problem with your account or privileges on that account.
if there won't be anyone being able to help you, you should try and ask your question on https://unix.stackexchange.com/
cheers and good luck
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I am aware that the USB drive can be damaged if you disconnect it without ejecting it first, but is it possible to damage the computer itself?
I've disconnected my USB drive from my Macbook Pro Retina and the OS gave me a warning about an incorrectly unplugged USB drive. Can this damage the computer?
You won't damage the computer unless you remove the drive violently enough to cause physical damage to the USB connector -- that said, you might cause problems with the file structure on the USB drive, which might cause the drive to become read-only or even cause loss of data, and some operating systems (in my experience, older version of Windows, but I have little experience with Mac OS) may become confused and be unable to remount the same USB volume until you restart the computer.
I have done that countless times and I have never noticed any damage, but I have used PCs only, no MACs.
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I would like to dual boot ubuntu 12.04 and OSX Lion. Is there a way that I can access all my music, documents, etc. from my ubuntu partition?
You should be able to read the OSX partition from Ubuntu without any modifications. You might have to mount the partition, although I would expect Ubuntu to automatically mount it read only, so you just have to find the partition in the file browser and open it.
OSX by default uses journaled HFS+ as it's file system. Ubuntus kernel has support for this file system built in. If you want read/write access to the OSX partition, you have to disable journaling in OSX. Here are some guides with more details:
https://help.ubuntu.com/community/hfsplus
http://manpages.ubuntu.com/manpages/intrepid/man7/hfsplus.7.html
Note that I would not recommend disabling journaling, and I do not recommend writing to the OSX system partition from a different OS. If you want to read and write to some files from both OSs, you should create a separate partition for this purpose. Non-journaled HFS+ would work as a file system, FAT 32 should also work.
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Windows recognizes and gives my fedora partition a drive letter, but it shows it as blank. Is there a way to get windows to read ext3 filesystem? Its a Fedora 10 partition.
I'd take a look at EXT2 IFS for Windows.
Several things to keep in mind with this.
Ext3 is backwards compatible with Ext2, it just doesn't write to the journal
NTFS is case insensitive, this may screw with you depending on what you are moving
Some filenames that are valid in Ext2/3 are invalid in NTFS/VFAT like : and $
Special files will be inaccessible, sockets, soft links, block devices
permissions are not maintained
Will not work with LVM volumes
It will let you read and write to it though ;)
I know that you want to mount your Fedora partition but from experience I have found that the best way to share a partition with Windows is to format as NTFS and use ntfs-3g to access it in Linux.
I tried using the ext2 Windows app mentioned by JensenDied a couple of years ago and ended up having problems accessing data on the USB drive that it was being used with.
See the answers to my similar question on ServerFault.com:
What Windows ext3 driver should I use?
Summary of the best answer I got (and other answers were later deleted, I assume by their authors): Use ntfs-3g to access the NTFS filesystem from Linux. You will have a much smaller chance of filesystem corruption doing it this way than using any of the existing ext2/3 drivers from Windows.