Extremely slow card reader (write speed: 20 mb/s)

Hey Folks,
I got a MacBook Pro with Retina Display and an internal card reader. I bought some SD cards with speeds of 45 mb/s (write) and 90 mb/s (read). I tested them on a external USB 3.0 card reader and so I got nearly this speeds, but the internal card reader of my mac reads with 25-40 mb/s (it's ok), but writes only with 15 up to 20 mb/s.
I already checked the link speed in the system information: 2.5 GT/s, so it has to be connected with PCIe and not USB, but I can't figure out where the problem could be.
Any suggestions?

Push.

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That does seem slow - on the other hand, what are you using to measure it?
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ishjen wrote:
Anybody know how fast the read/write speeds are with a USB hard drive and the Airport Extreme Base Station?
Welcome to Apple's discussion groups.
Apple's AirPort base stations aren't known for fast file serving, but for most purposed they're fast enough.
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hi Daew,
Welcome to the Lenovo Forums.
The results that you got while running CrystalDiskMark is normal. The SATA 2 (3Gb/s) that you mentioned is actually the SATA interface support, not the actual read/write performance.
If you have a Seagate HDD (eg. ST10000LM024), check these specs
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ishjen wrote:
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Trey992 wrote:
I'm really disappointed, considering I spent $1200 on a portable laptop, I expect it to be pretty much perfect, and it's a let down knowing I didn't get what a lot of other people paying the same price might be getting. Anything on this Apple?
Are you looking to get a response from Apple here? If so you're going to be left wanting. This is a user-to-user discussion forum, if you wish to communicate with Apple you'll need to get on the phone with AppleCare or bring it into the store.
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Extremely slow card reader (write speed: 20 mb/s)

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