In linux, block devices are accessed [...] in large contiguous blocks of data, while character devices, are accessed sequencially one byte at a time.
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18. UNIX Devices ls -l /dev/hda shows a b on the far left of the listing, which means that your hard disk is a block device: brw-r----- 1 root disk 3, 64 Apr 27 1995 /dev/hdb Serial devices, on the other hand, <span>are accessed one byte at a time. Data can be read or written only once. For example, after a byte has been read from your mouse, the same byte cannot be read by some other program. Serial devices are called character d