On Thu, 26 Aug 2021 10:56:47 -0700
Samuel Sieb <sam...@sieb.net> wrote:

> On 2021-08-26 10:34 a.m., Roberto Ragusa wrote:
> > On 8/26/21 2:57 PM, Geoffrey Leach wrote:  
> >> On Thu, 26 Aug 2021 09:11:34 +0200
> >> Roberto Ragusa <m...@robertoragusa.it> wrote:
> >>  
> >>> On 8/26/21 7:01 AM, Geoffrey Leach wrote:  
> >>>> On Wed, 25 Aug 2021 21:26:19 -0700  
> >>>  
> >>>>> You could add a "sync" after the copy and before the "umount".  
> >>>>
> >>>> Just what I needed. Thanks.  
> >>>
> >>> Absolutely not.
> >>> If umount is failing to do a complete flushing by itself it is a
> >>> serious (press-release level) bug and must be investigated.
> >>>
> >>> Which filesystem are you using?  
> >>
> >> ext4 -> vfat  
> > 
> > The destination is the importat part: vfat.
> > Are you sure the umount is successful?
> > Maybe umount fails immediately because of something else locking
> > the disk (e.g. a cd into the mounted path is enough to make umount
> > fail), the script finishes and you remove the disk assuming it has
> > been unmounted but it has not been.  
> 
> Are there any messages from the umount command?  If you run "mount",
> is the drive still mounted?

No messages, but findmnt confirms that the device is still mounted,
whereupon umount finished clean.
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