Is this write speed normal or I'm I having a faulty disk?

Question

Is this write speed normal or I'm I having a faulty disk?

I'm Malshan,

I've recently bought a new MacBook Pro-15 2019.

Specs are:

i9 2.3GHz

16GB RAM

512GB SSD.

My concern is about the write speed of the disk. It's around 1800 MB/s. Please refer the below image. Is this normal or I'm I having a faulty disk? In the internet I saw disk speed is almost identical for both read and write and it's around 2500 MB/s.

I highly appreciate your help.

Thank you very much!

[Re-Titled by Moderator]

MacBook Pro

Posted on Aug 9, 2019 1:54 AM

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Answer 1

Best reply

Grant Bennet-Alder

Level 10

127,993 points

Aug 11, 2019 8:44 AM in response to MalshanFernando

Here is a test of my 3.5-in rotating Magnetic drive, installed in an internal bay in a Mac Pro silver tower. This drive was selected because it is especially fast for a rotating magnetic drive.

I think you have NOTHING to worry about.

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Answer 2

Aug 11, 2019 7:36 AM in response to HWTech

Hi,

Sorry for the late reply. HWTech, your help gave me a huge relief. I'm completely new to Mac so I'm bit worried about the performance of this device. Except the above issue, everything else is fine.

Thanks for the answer again.

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Answer 3

Aug 11, 2019 10:31 AM in response to Grant Bennet-Alder

Hi Grant Bennet-Alder,

Yours read and write speeds are almost the same even it's not a SSD. That's the concern I have with my disk since it doesn't. But I now think there may be some other things which I suspect is the fileVault could cause this problem but I'm not sure at all. The difference is roughly 700 MB/s which is in my opinion is huge. I hope someone with this very specs will submit a result so that we can make sure that my result is acceptable or no I think.

Thank you so much to support me.

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Answer 4

HWTech

Level 9

56,210 points

Aug 11, 2019 11:32 AM in response to MalshanFernando

Filevault will slow down the write speed on your tests. I don't normally test SSD speeds while booted from the SSD being tested since the results are not that reliable (Filevault, Spotlight indexing, software updates, etc. all interfere), but I have seen other users show significant differences between read & write speeds on their test results.

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Answer 5

Aug 11, 2019 6:19 PM in response to MalshanFernando

Writes are normally quite a bit slower. Adding a write buffer can make the drive appear to write faster, but there is a trade-off.

Some manufacturers choose to add a larger buffer for write data, others use a smaller one. The larger the buffer, the higher the risk that data might be acknowledged, but a problem or power failure may intervene that results in data loss, so this is a real trade-off, not just a cheap-out kind of a choice.

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