in specs mikrotik do not inform nand size
today i have this unpleasant surprise only 16mb 
hex resources.jpg
of course latest rotueros and firmware 6.32.3 and firmware 3.27
So what ? 16 mb nand size is enough for normal use. And remeber this is only a router, not NAS to storing files. 
im not even thinking about use a mikrotik as a NAS
local storage its useful for another things:
local log storage
partitions
store backups
this budged mikrotik products normally come with at least 32mb of nand
for example the rb951Ui has 128mb and even the cheap rb951-2n has 128mb too
this device do not have micro sd and/or usb port to expand storage so its a big limitation
Wow, that can’t be right.
You don’t even have enough free space to do an upgrade!
Hopefully it’s just being reported wrong.
hex files.jpg
Upgrade is done in RAM. For RouterOS you don’t need a lot of storage, disk is almost never used. It is enough for most features. Your mentioned log to files and partitions are features for CCR or more powerful devices.
What power is needed for partitions? Or for normal logging? None. Of course it is not smart to log to build-in flash anyway.
Most of the smaller devices now have SPI FLASH instead of NAND. SPI has 16MB of storage space. It is plenty for normal use, and upgrade is done in RAM anyway. So you should be cautious of this fact, if you intend to use the built in SPI. Look for a device that has USB ports if you need storage.
ok then please inform us in datasheets of this fact, many new devices do not inform storage size in documentation
its a unpleasant surprise to discover it after buying it
i encountered logging to build in flash a usefull feature to diagnose issues on remote locations with frequent connectivity and power issues, not all clients or installations have the connectivity or infrastructure to implement a syslog server
can you explain me why do you find is not smart to do logging to build in flash? maybe im missing something
Flash is not very good for writing large volumes of data. Logging to flash can wear the flash really fast.
It is not smart because the flash has limited number of write cycles. By logging to flash it will damage it quite soon. Therefore logging to usb flash disk, CF or SD card is much better. The best is to log remotely to log server (you can use Dude or whatever else logserver).
thanks for the advice, in that cases i only log important events it generates only 1000 kbyte of logs monthly
Is that just with the online packages upgrade process?
What is the recommended process for offline upgrading without working direct connection to the internet? I would usually drag the upgrade file into winbox, but doesn’t that copy to the flash in this case.
No, all upgrade is done via RAM
Key word here i think is RAMDRIVE.
So while board is powered you have the same experience as regular flash.
Only problem is when you powercycle/reboot. All content from RAMDRIVE is gone.
So files that you like to keep you need to put in /flash/ folder
Upgrade process happens before actual powercycle/reboot so you are fine.
Hi.
Should we ask NOT to DISCONTINUE the good old RB750GL version ? It has 128MB Flash HDD capacity, AND 64MB RAM.
The new and “better” RB750Gr2 (hEX) has only 16MB Flash… for the same price. 
(I bought one on last week, but today I gave it back to the distributor and changed to RB750GL !!!)
Best regards: CsXen
Járt utat járatlanért el ne hagyj…
I believe that 99.9% of mikrotik users, don’t use onboard storage. Is usesless.
I need to be able to use the partition feature, 16mb flash is useless to me.
Please document flash sizes.