Assuming that your boot drive is the only other drive, and that you have not 
used File Vault or BootCamp, then power up the machine, and when you hear the 
chime (and *only* when you hear the chime) press and hold Option.  Wait a good 
twenty seconds, just to be absolutely damned sure.  Then press left arrow one 
time, and Enter.  Wait, a good minute and possibly more.  Then press VO+F5.  
Turn up your speaker volume (the attached ones) nice and loud so you can 
actually hear the bloody thing.

Now use Disk Utility from the Utilities menu or table to partition your 
internal drive.  Select the physical disk from the table; not the partition.  
It will be named something like “Apple SSD” or “Something something HD Media” 
or something of that nature; choose that, and then the Partition tab.  Create 
one partition of type “Mac OS X Extended (Journaled)”.  Give it a name by 
typing something meaningful into the box (“Macintosh HD” is what it shipped 
with but I always like “Macintosh SSD” on my SSDs).  Press Options, and choose 
GUID Partition Table (it should already be set) and then OK to close that 
dialog box.  Press Apply, and reply to the alert by pressing Partition.  Quit 
Disk Utility, and proceed with the installation to your internal volume, which 
will have the name that you gave it.

Optional, but recommended: after partitioning the disk but before installing, 
shut the machine down from the Apple menu and wait a bit.  Disconnect all 
physical peripherals and cables, including power.  Wait 20 seconds then 
reconnect only the power.  On a portable, press Control+Option+Shift+Power to 
reset the SMC.  Reconnect your USB drive, and then press power; when you hear 
the chime, and again, *only* when you hear the chime, press Command+Option+P+R 
and wait for the machine to chime at least two times; this resets your 
parameter RAM.  Now let up on the keyboard and allow your box to boot up again 
from the USB drive.  Once again press Command+F5, and this time directly 
install onto your internal disk.  You may of course also reconnect your other 
peripherals now.

Important: only Apple-supplied SSDs get TRIM by default and other drives must 
have it manually enabled (yay Apple, keep it up, you’ll see the light yet).  
Unless you modded your Mac you have nothing to fear—and if you modded your Mac, 
you probably don’t need these instructions.  But for those that did, remember 
to invoke the trimforce tool at least once your system is installed to switch 
TRIM on.

That’s everything …

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