That speed test shows the read and write data rate TO YOUR HARD DRIVE. You can replace the Hard Drive with an SSD if you want faster Read and Write rates.
IT may cost you some money. Is there a performance problem you are experiecing that makes you want to trade money for speed?
If it is just the information regarding the data rate I suggest you hold onto your money. If you are doing something that is taking too long and you NEED more speed, then look into SSD drives.
Easiest things to change are:
1) Add more RAM
2) get a faster HD (maybe higher rotational rate... like a 7200 RPM)
3) Switch to an SSD
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FROM SYSTEM INFORMATION (in the utilities folder)
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HGST HTS721010A9E630:
Capacity: 1 TB (1,000,204,886,016 bytes)
Model: HGST HTS721010A9E630
Revision: JB0OA3J0
Serial Number: <OMITTED>
Native Command Queuing: Yes
Queue Depth: 32
Removable Media: No
Detachable Drive: No
BSD Name: disk0
Rotational Rate: 7200 <------ compare this
Medium Type: Rotational
Partition Map Type: GPT (GUID Partition Table)
S.M.A.R.T. status: Verified