What Is Mac Os X Base System Partition

When selecting that first entry called apple hdd st1000lm024 media and going into the partition option what i see is what i ve posted on picture 2 of the original post.

What is mac os x base system partition. Deleting and merging the recover hd partition may not be a necessary. Mac os x contains a variety of tools for repairing disk partition and file system errors. Press command r at startup to try using the built in recovery system instead of internet recovery. That s because it s a compressed disk image and i m pretty sure that compression is the reason they bother with all this disk image trickery.

See what is the mac os x base system disk image on my 2011 macbook air. If you re not prompted to choose a wi fi network during startup move your pointer to the top of the screen then choose a network from the wi fi menu if available. Could not find installation information for this machine. These options work like chkdsk on windows checking for disk and file system errors and repairing them.

The partition is removed reformatted and all free space is assigned to the previous partition. In the pie chart select the partition you want to delete then click the delete button. Quick side note for devs with lion developer preview. Trawling through online forums people have had this sort of problem when there s a hdd failure or a cable problem but mine is a direct result of restoring the os x base system over the primary internal drive.

Pressing the sign to create a new partition doesn t work and it shows that the only partition available is the os x base system that is the size of the hd 1 tb. When possible use the optional size field to control the size of a drive segment instead of the pie chart s dividers. The pie chart interface for adjusting volume size is picky. When enlarging a volume the volume or partition that is directly after the target volume must be deleted to make room for the enlarged target volume.

The mac os x base system image is not the cause of your problem. You can perform a check from within mac os x but it may sometimes be necessary to use recovery mode to fix problems. If you are installing mac os on a fresh hard drive then rather pressing cmd r on startup you need to press and hold only alt opt key on system startup. Hidden means it s not just a matter of using your dual boot to go into 10 6 and then deleting it with disk utility.

Os x base system is the recovery partition used to install os without jan 22 2014 examine disk utility. This is the mac os x base system. The last volume on a drive can t be enlarged. My best guess based on the screenshot as to why you can t repartition the hitachi disk is that it s the current startup device.

Actually basesystem dmg is compressed down to only 451mb at least in os x v10 7 0. Notice that the recovery hd is only 650mb but mac os x base system is 1 4gb. I need to restore my old macintosh hd to dev disk0 instead of only seeing the os x base system.