178 The Information Company
connections are not uncommon. The table below lists the most common issues seen
when trying to mount and acquire an Apple computer in TDM.
No detection on TX1; Apple
computer boots to normal
user login screen (not in
target disk mode)
Pressing the “T” key on the keyboard during bootup is how
Apple computers are put into target disk mode. This mode
is indicated by connection logos moving around the
screen that show the different ways an external device
can be connected to the target Apple computer
(dependent on the available connections on that
computer).
If the Apple device does not enter target disk mode after
pressing the “T” key during bootup, it may be defective
and alternative methods for memory acquisition may be
required (such as drive removal, if supported, or third
party services that specialize in hardware based forensic
data retrieval).
With the advent of the T2 secure enclave interface, it’s
also possible that the System Preferences on the Apple
device are set to block remote booting, which disables
entry into target disk mode. If possible, change the
System Preferences to allow remote booting, and then
retry the TDM boot sequence.
No detection on TX1; Apple
device is in TDM, but more
than the USB logo is shown
on the Apple screen
This condition indicates that the Apple device is not
properly connected to a powered-on TX1. This is most
commonly caused by the use of a defective cable between
the Apple computer and TX1. See “
Apple Target Disk
Mode acquisition adapters” on page 171
for
recommended cables. If you are already using the
recommended cable and it has been used successfully in
the past, try gently bending the cable at each end or in the
middle to see if the logo pattern on the Apple screen
No detection on TX1; Apple
device is in TDM with only
the USB logo on the
screenWhen connecting
an Apple computer to TX1,
the order of operations
matters.
The recommended steps are as follows:
• Power-on the Apple computer while pressing the “T”
key until only the USB logo appears on the screen.
• Power on TX1 and ensure it is fully booted to the
Home screen.
• Connect the interface cable to the Apple computer
first, and then to the USB-A connector on the source
No detection on TX1; Apple
device is in TDM and all
cabling is solid
As mentioned in “Apple Target Disk Mode acquisition
adapters” on page 183 above, it’s possible that the Apple
computer you are attempting to acquire is a newer version
with a T2 security chip. TX1 does not currently provide a
means of detecting or unlocking drives from a T2 Apple
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