2018 MBA 128gb SSD speeds....

torana355

macrumors 68040
Original poster
Dec 8, 2009
3,391
2,270
Sydney, Australia
Hi guys just curious what others are getting on Blackmagic for the 128gb model, I'm only getting 500MB write and 1800MB Read which is lower then the reviews I've seen.
 

BLBL

macrumors 6502a
Apr 11, 2018
710
100
That's about the same I'm getting on Blackmagic with 5GB test size. It goes 100-200MB higher using 1GB test size.
I think that is normal for 128GB SSD since they have slower write speed than their 256GB or bigger counterparts.
It seems that in most reviews they have 256GB version, as well as most peoples posting these forum have something better than entry level model.

Could you comment how is your Air 2018 battery health? I curious to hear what other see on their new Air 2018 and which way it goes after first few charge cycles. Also do you remember what battery charge level your Air had when you unboxed it? Mine came with completely empty battery and would not even turn on until charger was plugged in. Battery seems weakening very fast on mine. Now just 6 charge cycles and it is already down to 97.9%. Hard to believe that would last anywhere near promised 1000 charge cycles. Also can you say what brand battery is installed in yours? It shows that on CoconutBattery and it also tells that in system information
 
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torana355

macrumors 68040
Original poster
Dec 8, 2009
3,391
2,270
Sydney, Australia
That's about the same I'm getting on Blackmagic with 5GB test size. It goes 100-200MB higher using 1GB test size.
I think that is normal for 128GB SSD since they have slower write speed than their 256GB or bigger counterparts.
I seems that in most reviews they have 256GB version, as well as most peoples posting these forum have something better than entry level model.

Could you comment your battery health? I curious to hear what other see on their new Air 2018 and which way it goes after first few charge cycles. Also do you remember what battery charge level your Air had when you unboxed it? Mine came with completely empty battery and would not even turn on until charger was plugged in. Battery seems weakening very fast on mine. Now just 6 charge cycles and it is already down to 97.9%. Hard to believe that would last anywhere near promised 1000 charge cycles.
Sure thing, how do I check the battery health?
 

BLBL

macrumors 6502a
Apr 11, 2018
710
100
It is the easiest way to use CoconutBattery. I'm using it. You can download free version here: https://www.coconut-flavour.com/coconutbattery/

In that program full charge capacity tells what capacity your battery really has and design capacity tells what it should be (nominal capacity. I guess they all should have 4381mAh) and also percentage on real capacity.
 

BLBL

macrumors 6502a
Apr 11, 2018
710
100
OK. That sound about what it should be. Obviously I lost (again) in the battery lottery. Can you check manufacturing date? It tell that also in Coconut.
Could you turn your on when you first got it without plugging in charger?
 

torana355

macrumors 68040
Original poster
Dec 8, 2009
3,391
2,270
Sydney, Australia
OK. That sound about what it should be. Obviously I lost (again) in the battery lottery. Can you check manufacturing date? It tell that also in Coconut.
Could you turn your on when you first got it without plugging in charger?
Manufacture date is 2019-06-03

Yes I could turn it on when I first got it, I think it had about 70 percent battery.
 

BLBL

macrumors 6502a
Apr 11, 2018
710
100
OK, so yours was just manufactured few weeks ago with fresh battery. Mine was about 5,5 months ago manufactured. They should put best before stamps on these. :)
Obviously long storage time in warehouses may cause batteries to deplete… But still I don't think battery should run down to 0% even at that time since power off consumption is very low usually on computers these days.

Usually Apple gear I bought had about 70-80% battery even if manufacturing date was not "fresh" and that is about what I expect them to be even today. Some peoples claim new transportation regulations require them to be shipped with empty under 30% battery but from what I read on those documents, it only applies to bare batteries not devices containing battery (which is obvious since they consume some power even turned off and depleting battery will kill the battery since Li ion batteries get damaged is stored empty).
 
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torana355

macrumors 68040
Original poster
Dec 8, 2009
3,391
2,270
Sydney, Australia
OK, so yours was just manufactured few weeks ago with fresh battery. Mine was about 5,5 months ago manufactured. They should put best before stamps on these. :)
Obviously long storage time in warehouses may cause batteries to deplete… But still I don't think battery should run down to 0% even at that time since power off consumption is very low usually on computers these days.

Usually Apple gear I bought had about 70-80% battery even if manufacturing date was not "fresh" and that is about what I expect them to be even today. Some peoples claim new transportation regulations require them to be shipped with empty under 30% battery but from what I read on those documents, it only applies to bare batteries not devices containing battery (which is obvious since they consume some power even turned off and depleting battery will kill the battery since Li ion batteries get damaged is stored empty).
You do realise battery apps don't know the exact mAh of your battery, it's an estimate, you may be worrying over nothing. Mine fluctuates from 4375 all the way to 4390. It's also possible your battery was underspeced slightly from factory hence the lower health.
 

BLBL

macrumors 6502a
Apr 11, 2018
710
100
Yes I know but these do have strong correlation how battery can hold voltage. Also like I mentioned your iPhone X'es they have the same hardware and they have the same way to estimating the battery so there is obvious difference between the batteries. I'm sure if swapping batteries between the two units they would show the battery health also so that another iPhone now that has better battery shows better health and other not.

Battery capacity fluctuating is quite normal depending on load but as you can see yours is well within nominal 4381 or even above, just as it should. Usually in devices with good battery it will stay there for quite some time and deplete only after many months. For example in our iPhones the one that has strong battery has been abused all the time by letting battery run empty and so on but no sign of weakening while one with bad battery has been babied and still weakening all the time. So huge difference about what quality battery is in the device.


Could you also check if you seen any display problems in yours like I described here?
https://forums.macrumors.com/threads/2018-air-screen-10-14-5.2181179/


I found out that these have something to do with color profile especially if toggling between night shift on/off but even still these are this banding in those photos I posted. Especially I'm interest if your see that dark shade banding on Lagom LCD gradient test when toggling night shift on/off with Safari browser.
 

torana355

macrumors 68040
Original poster
Dec 8, 2009
3,391
2,270
Sydney, Australia
Yes I know but these do have strong correlation how battery can hold voltage. Also like I mentioned your iPhone X'es they have the same hardware and they have the same way to estimating the battery so there is obvious difference between the batteries. I'm sure if swapping batteries between the two units they would show the battery health also so that another iPhone now that has better battery shows better health and other not.

Battery capacity fluctuating is quite normal depending on load but as you can see yours is well within nominal 4381 or even above, just as it should. Usually in devices with good battery it will stay there for quite some time and deplete only after many months. For example in our iPhones the one that has strong battery has been abused all the time by letting battery run empty and so on but no sign of weakening while one with bad battery has been babied and still weakening all the time. So huge difference about what quality battery is in the device.


Could you also check if you seen any display problems in yours like I described here?
https://forums.macrumors.com/threads/2018-air-screen-10-14-5.2181179/


I found out that these have something to do with color profile especially if toggling between night shift on/off but even still these are this banding in those photos I posted. Especially I'm interest if your see that dark shade banding on Lagom LCD gradient test when toggling night shift on/off with Safari browser.
Yes I have banding on this MBA, my 27" iMac at work and my Samsung S10 has it too.
 

BLBL

macrumors 6502a
Apr 11, 2018
710
100
Interesting, for example my desktop Dell monitor on my Windows desktop has almost none and my iPad 2018 has absolutely zero.

Do you see banding effect happening on Lagom LCD gradient test with your Air 2018? Especially does it start to show when you toggle night shift on and then back off?

Mine is nearly perfect until I turn night shift on and does not go back when turning off, I have to power down computer or toggle between color profiles to get is good without night shift. With night shift on it never looks perfect. Problem shows only in darkest shades of that gradient pattern.