If your sysadmin at work restricts PC to not to have CD/DVD drives, you still can boot from USB flash disk. Bootable USB flash disks are useful as boot devices on the «big» desktop PCs too, unlike CD/DVD discs they do not have sensible surface you could scratch, thus more reliable (especially when holding your backup data).On the other hand, buying external CD/DVD drive for netbook is not a truly wise choice because it will be shifted out of use just after Windows is installed, thanks to widespread use of DVD image files and modern hard disk capacities. Bootable USB flash disks are especially useful with netbooks like ASUS Eee PC which does not have builtin CD/DVD drive or an opportunity to install one.Again, the cost per gigabyte for them continues to cut down, unlike CD/DVD discs. Unlike the most bootable medias, bootable USB Flash keys are very handy: compared to floppies, they have much bigger size, speed and reliability, compared to CD/DVD discs, they are random write access devices, so you can backup your data to the same media where you booted from, without need to reformat (reburn) the entire media.
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