Hard disks have a small amount of RAM cache to speed up write operations. The
system can write a chunk of data to the disk cache without actually waiting
for it to be written to the disk. This is sometimes called "write-back" mode.
If there is no cache on the disk, data is directly written to it in
"write-through" mode.
The Asking for cache data failed warning usually occurs with devices such as
USB flash drives, USB card readers, etc. which present themselves as SCSI
devices to the system (sdX), but have no cache.
The system asks the device for cache and gets no response. So it assumes
there is no cache and puts it in "write-through" mode.
https://askubuntu.com/questions/167343/what-is-a-asking-for-cache-data-failed-warning
This may help?or not...i have no idea if you perform this if you are actaully
booting trisquel from USB
The hdparm utility allows to enable or disable write caching for IDE-based
drives. Be very careful with hdparm, as it can do a lot of nasty stuff to
your hard drive.
/sbin/hdparm -W 0 /dev/hda 0 Disable write caching
/sbin/hdparm -W 1 /dev/hda 1 Enable write caching
/dev/ sdb
https://superuser.com/questions/526248/turn-off-write-cache-on-all-usb-external-drives-debian-ubuntu-linux
