54 The Information Company
IDE drives with a DCO require special considerations with TX1. This is due to the fact
that IDE drives are connected via the PCIe interface using a Tableau IDE Adapter
(TDA7-5). DCO setting changes require power-cycling the drive which, for directly
connected SATA drives, is done automatically by TX1. PCIe, as implemented on TX1,
does not allow for hot drive removal (including power-cycling).
To disable a DCO on an IDE drive:
1. Confirm that TX1 is powered off.
2. Connect the IDE drive to a Tableau IDE Adapter (TDA7-5) and connect the adapter
to the TX1 PCIe port. Note that IDE drive power does not come directly from the
TDA7-5 adapter. A separate power cable is required to connect the IDE drive power
interface to one of the source SATA/SAS drive power connections.
3. Connect any other drives required for the eventual duplication job and power on TX1.
Note: TX1 will not allow any other jobs to be started or queued when an IDE drive
HPA/DCO/AMA disable job is in progress. This includes disallowing the Shelve DCO
feature for duplication jobs. This is because a system reset will be required to
redetect the drive after the DCO is disabled, which would terminate any other jobs in
progress.
4. After TX1 has booted to the Home screen and the IDE drive is detected, navigate to
the Sources drive list and tap on the IDE drive tile to open its drive details screen.
5. Select the HPA/DCO/AMA Disable media utility, optionally enter case information,
and then tap the Remove HPA/DCO/AMA button to start the operation. The system
reset will occur immediately after TX1 issues the removal commands to the drive.
The log will reflect successful completion of the DCO disable operation after the
command has been issued to the drive, before the system reset has occurred. TX1 has
no way of knowing if the command actually completed at the drive level. The DCO state
should be manually verified after the reboot is complete and before subsequent jobs are
started.
TX1 also provides the ability to “shelve” a DCO or AMA, which means disabling a source
drive DCO or AMA for the purposes of evidence duplication and then putting the same
DCO/AMA back after the job is complete. See “Duplicating” on page 64 for more details
on shelving a DCO.
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