I am aware of this, my KX-TVA50 is flash memory based attached to my KX-TA824. The KX-TVS200 I had prior had a hard drive.
I couldn't understand why the unit seemed so light in weight of it had a HDD. There was also a nice spider web spun over the the card which the flash memory plugs into also.
I suppose spider might have tried to assimilate-with the flash drive?
There is no hard drive because it was removed and replaced with a solid state hard drive by a refurbisher.
-Hal
Unfortunately Flash Memory over time has a whole set of its own problems different, yet similar to an aging HDD..... sigh