Wireless transfer speeds?

Discussion in 'Mac Accessories' started by ggulliver, Aug 15, 2012.

  1. ggulliver macrumors member

    Joined:
    Jan 22, 2008
    #1
    I'm considering buying a wireless NAS for backup, but am concerned by what some consider to be unreasonably slow transfer speeds.

    I'm non-tech and struggle to understand much of this stuff, so hopefully I can explain this well enough.

    If I've understood things correctly, even though wireless (300Mbps) will only transfer at approx two-thirds of USB2 (480Mbps), the likely rate is 30 MB/sec and so a 1gb file should transfer in approx 30 seconds plus some extra time for the drives to handle things - a total of maybe approx 45-60 seconds.

    So, from a practical viewpoint, the slower transfer doesn't seem to be a big problem. Or have I gotten this completely wrong?
     
  2. robbieduncan Moderator emeritus

    robbieduncan

    Joined:
    Jul 24, 2002
    Location:
    London
    #2
    300Mbps is under absolutely ideal lab conditions with the devices basically sat on top of each other. Try and find some real-world tests. I suspect the real speed will be half that or less.
     
  3. WesCole macrumors 6502a

    Joined:
    Jul 1, 2010
    Location:
    Texas
    #3
    With my Airport Extreme, I usually only get ~6-9 MB/sec...
     
  4. waw74 macrumors 68030

    Joined:
    May 27, 2008
    #4
    for file transfers inside my network, I normally get around 11 MB/s, maybe 14 in short bursts.

    on a retina MBP, and linksys e4200 - 5GHz- 802.11n.

    if you've got older G wireless, expect it to be around 1-2 MB/s

    USB should be around 25-30 MB/s

    at 11MB/s a 1GB file should take about 1:42.
    Speed calculator
     
  5. Kurwenal macrumors 6502a

    Kurwenal

    Joined:
    Jun 27, 2012
    #5
    I average around 10 using current-model Extremes. The first backups (using a combination of Time Machine and SuperDuper!) are painful but after they complete I find that the subsequent, incremental backups are fine and happen in the background (or at night) without me even noticing.
     
  6. waw74 macrumors 68030

    Joined:
    May 27, 2008
    #6
    small update...

    i've been using dd-wrt on my linksys. the wireless has been been a bit flakey (as was noted in the dd-wrt forums), had to reboot every day or 2 when the wireless dropped out.
    Just reverted to factory firmware, I'm getting 33 MB/s up and down (yes big B, not little b), in the same room, about 5-10 feet away from the router. using both activity monitor during a file transfer, and using black magic disk speed test to read/write to a network drive.

    this is 5GHz N, wide channel.
     

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