I have MacBook Pro 2015 with 128 SSD and want to have some extra storage.
The possible solutions I know are (all external): HDD, SSD, Flash.
Are there any information about the performance of using any of the solutions comparing to my internal SSD?
MacBook Pro Storage – External SSD or HD Performance Compared to Internal SSD
macbook prostorage
Related Solutions
It turned out that the hard drive cable was broken. Replacing it fixed the problem completely.
I had this setup for a while and yes, the hard drive in the primary disk bay would spin down when booted from the SSD. It was fairly easy to tell, because when accessing the drive there was a noticeable delay when first accessing the drive after leaving it idle for about 10 minutes. This was on an older machine (2009 MacBook Pro 15", running Mac OS X 10.7).
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Best Answer
An external HDD is going to be ~100 MB/s, an external SSD closer to ~500MB/s, the SD card expanders (such as tardisk or transcend jetdrive) have read/write speeds only slightly slower than that of the HDD (~75MB/s). However, the SD expander has the advantage of not actually being external (it sits flush to the edge of the MBP and occupies the SD card spot). Your internal SSD likely has speeds close to ~700MB/s. Network attached storage will only be as fast as your connection. If you have an "N" network, your speed will max out at ~35MB/s, with an "AC" connection or gigabit Ethernet you should have no problem getting full ~100MB/s speeds.