downloading at the same time uploading

I don't know how SSD or spinning hard drive works, but would it cause more wear to the drives if downloading and uploading at the same time?



or is it better for the hardware to only either upload (reading) or download (writing) but not doing both at the same time?

 

It doesn't matter.

 

On an HDD this could cause an ever so slight usage increase in seeks but that is about it.

 

Packet is killing each other therefore there is a slight chance of data corruption.

 

That's an interesting claim, though it's also not a true claim. Your drive I/O is placed in a queue and the operations are performed when the drive is able to do so. A more detailed explanation (for HDDs, but the principle is the same with SSDs; just replace platters with NAND chips): http://superuser.com/questions/3658...-write-simultaneously-on-different-tracks-how

 

For a given workload volume, the 'wear' would be the same.

What will be different is the performance. HDD's and SSD's are not able to read and write at the same time (they are half duplex designs) - therefore the performance will suffer.

How much depends on the workload/workflow and the specific controller and nand combination in question. 3D TLC nand? Watch the electrons flow in slow motion...

With a HDD... the faster the platter speed and the less dense the platters are (at any given tech year/level...) - the faster it will be (or in other words; the less the performance will suffer...).

With both SSD's and HDD's:

• the less full they are the faster they will be with all storage related performance.
• allowing the operating system to use less than the full capacity speeds up performance too.
  • with an HDD - it's called short stroking and using the first 10% of the drive will give the fastest and most consistent performance.
  • with an SSD - it's called OP'ing and what it effectively does is put the focus of the controller on the user - rather than the self preservation of the nand chips (usually; right when the user needs the performance most...).

'Wear' will depend on total work done/completed and not necessarily the order of that work/load.

What will vary greatly will be the performance, as stated above.