Trim after upgrade to Lion ?

Discussion in 'macOS' started by newkind, Jun 6, 2011.

  1. newkind macrumors newbie

    May 20, 2008
    Hi Everyone,

    I have placed an SSD drive with Trim support in my iMac with SL 10.6.7 I haven't played with any Trim enablers and I'm curious if after upgrading to Lion the Trim will start to work automatically and do everything it should do as it was there from the very beggining or will it require a reformatting hard drive ?

  2. maflynn Moderator


    Staff Member

    May 3, 2009
    There's a thread in the macpro forum to enable TRIM for non-apple SSDs in Snow Leopard and that did not require a reformat.

    As I understand it, TRIM basically tells the SSD that the block of data can be wiped internally. When not available, SSDs need to perform a wipe and then a write operation.

    My point in raising that is you'll not see an immediate benefit to TRIM as it only works when deleting (or moving) files.

    Finally many of the sandforce controllers already do a good job at internal garbage collection and people found that enabling TRIM on those SSDs in OSX slowed things down a bit

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