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Andrea Filippini

macrumors 6502
Original poster
Jun 27, 2020
394
339
Tuscany, Italy
In one session (about 10 hours on) of basic usage (Chrome, WhatsApp desktop, Spotify) my activity monitor reports over 10 GB of data written.
Is it a common thing between Catalina users?
My storage is a Samsung SSD 860 EVO 1TB (20% used).


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chabig

macrumors G4
Sep 6, 2002
11,327
9,011
It is massive. But the details of my machine aren’t something I watch. I don’t go looking for problems. I just use it.
 

Andrea Filippini

macrumors 6502
Original poster
Jun 27, 2020
394
339
Tuscany, Italy
It is massive. But the details of my machine aren’t something I watch. I don’t go looking for problems. I just use it.
Yeah the same.
I have no concern about it, the storage has 600 TBW and in extrema ratio I can replace it for a cheap price.
However a soldered storage especially less than 512 GB size is going to have some nasty troubles in the next couple of years with this rhythm of data written by the OS (and Big Sur seems particularly more avid).

EDIT: I have surpassed the 15 GB of data written in one session of basic usage (basically only Web browsing)

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Last edited:

saudor

macrumors 68000
Jul 18, 2011
1,510
2,112
yeah it's normal. macOS writes a crap ton of data. In windows, id use maybe 5gb a day. When I had iCloud enabled, i'd use 80GB per day (only had about 2gb or so in there but it'd sync over and over again non stop)

Your 1TB 860 should be fine though as long as you're not swapping excessively. Even a 2011 160GB INTEL SSD could do 700 TB + when it was only rated for 15 TB. a 840 256gb pro could do 2PB before it crapped out.

Just watch for that swap. A friend burnt out her SSD in two years because of excess swap
 
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Andrea Filippini

macrumors 6502
Original poster
Jun 27, 2020
394
339
Tuscany, Italy
yeah it's normal. macOS writes a crap ton of data. In windows, id use maybe 5gb a day. When I had iCloud enabled, i'd use 80GB per day (only had about 2gb or so in there but it'd sync over and over again non stop)

Your 1TB 860 should be fine though as long as you're not swapping excessively. Even a 2011 160GB INTEL SSD could do 700 TB + when it was only rated for 15 TB. a 840 256gb pro could do 2PB before it crapped out.

Just watch for that swap. A friend burnt out her SSD in two years because of excess swap
Is there a specific reason why macOS writes a crap ton of data?
Fortunately, I have no swap usage in activity monitor.

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saudor

macrumors 68000
Jul 18, 2011
1,510
2,112
Is there a specific reason why macOS writes a crap ton of data?
Fortunately, I have no swap usage in activity monitor.
It's really hard to tell. A lot of things tend to get lumped under Kernel task. In my experience, a lot of the writes were from iCloud Drive going rogue. Even after all these years, they havent figured out how to properly do delta syncs and periodically likes to download the entire file instead
 
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