Again, the trashed filesystem is a problems of FAT and other
simplistic file systems. It is not a problem to superior
(journalizing) filesystems.

Will a disk drive write to the platter as voltage drops? Of
course not. The disk drive controller is a complete computer
that also monitors voltage. It does not matter to disk
hardware when power is turned off. But it does matter to some
'simplistic' disk filesystems that power is not removed during
a write operation.

Just another reason why FAT was obsoleted by HPFS which in
turn was obsoleted by NTFS.

Pyriform wrote:
w_tom wrote:
BTW, utility does not institute a voltage reduction to save
money. Voltage reductions are a last ditch effort to avoid
rolling blackouts.

Or to avoid the expense of bringing additional generating
capacity online, thereby saving money...

All of which is irrelevant to HD protection. Either the
power supply will output correct power or it will shutdown.

A PSU shutting down is not irrelevant to HD protection.
Shutdown at the wrong moment (especially with the wrong
operating system) and you end up with a badly trashed
filesystem.