HOWTO safely unmount remove USB zfs sdcard

Russell L. Carter rcarter at
Tue Dec 11 20:02:46 UTC 2018

On 12/11/18 11:37 AM, Michael Sierchio wrote:
> I've been holding back, but - why? Why abuse an SD card that way?  My
> back-of-the-envelope estimate is that it halves the life of the card.

A) Rescue a system.
B) Refamiliarize myself with bringing up zfs pools and datasets.
C) I have dozens of sdcards.  It's been 12 months since I even touched
D) Not least, learn how to attach/detach physical zfs drives.

To really grasp the awfulness of my crime, consider that I only put
about 100MB on a 64GB (nominal) sdcard.  It's now back on the pile.

I will try to empathize with my sdcard population more, I promise :-)


> - M
> On Sun, Dec 9, 2018 at 4:12 PM Russell L. Carter <rcarter at> wrote:
>> Greetings,
>> I can easily create a ZFS filesystem on a USB sdcard,
>> but I have not yet found the recipe for safely unmounting
>> it and then mounting it on another 12.0 FreeBSD system.

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