Advice needed for new HD (sequential vs random speeds)

Discussion in 'Mac Pro' started by Loa, Jan 13, 2018.

  1. Loa macrumors 68000

    Loa

    Joined:
    May 5, 2003
    Location:
    Québec
    #1
    Hello,

    I'm looking to update some of my drives (mac pro 2009) and I'm hesitating between two drives. One of them has higher sequential R&W speeds while the other is faster in random R&W.

    The drive is not going to be used for OS (got that on a SSD). The task which will test the drive the most is opening hundreds of NEF files in Photoshop (average file size = 25MB) as well as saving PS files (bigger file sizes) and saving hundreds of jpeg files in a batch (average file size = 7MB).

    With such files sizes, is sequential or random speed more important?

    Thanks.
     
  2. pl1984 macrumors 65816

    Joined:
    Oct 31, 2017
    #2
    I would go with the drive that has better random access speed. It sounds as if this is a traditional hard drive. If so, cost permitting, I would recommend looking into an SSD as their random access speeds easily outperform a traditional HD.
     
  3. Loa thread starter macrumors 68000

    Loa

    Joined:
    May 5, 2003
    Location:
    Québec
    #3
    I need at least 6TB, so SSDs are out of the question. I know they're faster, that's why I use one for my OS.

    What I don't know is whether reading or writing ~7MB files is big enough so that the random read speed isn't as important as the sequential speed.
     
  4. h9826790 macrumors G4

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
    #4
    For photos, random speed is more important
     
  5. Loa thread starter macrumors 68000

    Loa

    Joined:
    May 5, 2003
    Location:
    Québec
    #5
    Thanks. I'm hesitating between getting a WD black or a seagate Ironwolf. The 8TB ironwolf is faster all around except for 1MB writes (where it is 15% slower). Currently I can get them for the same price.

    Not sure if I'm going to notice that 15% difference before I notice the extra 2 TB! :)
     

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