Basic memory and filesystem layout

Basic memory and filesystem layout
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We've already seen that the memory of the Z consists of 16M of writable flash for the operating system, either 32M or 64M of RAM and, possibly, extra storage on one or both of a CF card and SD card. What follows, then, is a perfectly typical example of memory and storage usage on a 5500, showing the correspondence between memory, filesystem device files and mount points, based on an install of a 40+24 zImage file:

   Device            FS type     Device name      Mount      Usage(?)

16M writable flash    jffs2     /dev/mtdblock4   /            75(?)%
64M RAM:
    40M memory        ----
    24M storage       ext2      /dev/mtdblock6   /mnt/ram     0%
64M CF card           vfat      /dev/hda1        /mnt/cf      0%
64M SD card           vfat      /dev/mmcda1      /mnt/card    0%

Some notes about the above:

You can examine your current memory, storage and filesystem configuration with any of:
```
# cat /etc/fstab
# mount
# df
      
```
Since OZ treats the 16M of flash as writable, you'll notice that you still have some root to install files to flash.
If you don't have a CF card or SD card, obviously you won't have the filesystems corresponding to that storage.
If you installed a 32+0 or 64+0 image file, you won't even have the /mnt/ram filesystem either.

	Tip
	You can examine storage and memory usage through the "System Info" Opie application as well.