Results 1 to 8 of 8

Thread: SSD Help

  1. #1
    mo2580's Avatar
    Join Date
    Feb 2012
    Posts
    195
    Thanks
    54
    Thanked 6 Times in 4 Posts
    Rep Power
    1

    Default SSD Help

    hi everyone,

    i just want to know what trim is really about?

    alot of people say only use ssd's with win 7 because of trim support and it felt at the time that the trim was some sort of advance wear levelling but now i have read about it looks as if its some sort of advance garbage collection.

    so which one is it?

  2. #2
    benzeman's Avatar
    Join Date
    Dec 2010
    Location
    Kent, UK
    Posts
    2,208
    Thanks
    218
    Thanked 167 Times in 152 Posts
    Rep Power
    1

    Default

    It makes the SSD wear out more evenly, as with a normal HDD if you don't use all it's capacity then your writes will all be near the start. With an SSD, if it's half-full, you can double it's lifespan by distributing your writes across the disk.
    PC: AMD Athlon II X4 640 @ 3GHz, ASUS M4A87TD/USB3, 2 x 4 GB Corsair XMS3 1333MHz, ATi 5670.
    Netbook: ASUS 1015PX - Intel Atom N570 @ 1.66GHz, 2 GB RAM

  3. The Following User Says Thank You to benzeman For This Useful Post:


  4. #3
    Tolmandary's Avatar
    Join Date
    Mar 2010
    Location
    Near Aberystwyth
    Posts
    470
    Thanks
    22
    Thanked 46 Times in 41 Posts
    Rep Power
    1

    Default

    Basically the disk manages how each individual cluster of data is used so they all get used evenly. With magnetic drives the data is written sequentially onto the drive so clusters nearer the start of the drive get used first and the only time those near the end will get used is if the drive is almost full or very badly fragmented. Because SSD's have far fewer read/write actions before a given cluster fails their lifespan can be considerably expanded by ensuring that all clusters are used at approximately the same rate as each other, also writing or reading data from any given SSD cluster takes the same time, whereas for magnetic drives the clusters inside the ring are faster to access and of course to reach the edge the read/write tips have to be physically moved outwards.

  5. The Following User Says Thank You to Tolmandary For This Useful Post:


  6. #4
    mo2580's Avatar
    Join Date
    Feb 2012
    Posts
    195
    Thanks
    54
    Thanked 6 Times in 4 Posts
    Rep Power
    1

    Default

    so is it safe to say that it is some sort of advance wear levelling system?

    Also do you know if the ssd drives have built in wear levelling similar to usb flash drives that have the FTL flash translation layer?

    thanks

  7. #5
    benzeman's Avatar
    Join Date
    Dec 2010
    Location
    Kent, UK
    Posts
    2,208
    Thanks
    218
    Thanked 167 Times in 152 Posts
    Rep Power
    1

    Default

    I have yet to see an SSD that doesn't support TRIM. You'll need windows 7 and supporting drivers though!
    PC: AMD Athlon II X4 640 @ 3GHz, ASUS M4A87TD/USB3, 2 x 4 GB Corsair XMS3 1333MHz, ATi 5670.
    Netbook: ASUS 1015PX - Intel Atom N570 @ 1.66GHz, 2 GB RAM

  8. #6
    Tolmandary's Avatar
    Join Date
    Mar 2010
    Location
    Near Aberystwyth
    Posts
    470
    Thanks
    22
    Thanked 46 Times in 41 Posts
    Rep Power
    1

    Default

    Be aware though that again TRIM doesn't work for SSD's in RAID arrays.

  9. #7
    mo2580's Avatar
    Join Date
    Feb 2012
    Posts
    195
    Thanks
    54
    Thanked 6 Times in 4 Posts
    Rep Power
    1

    Default

    does anyone know if ssd drives actually have some sort of wear levelling in built?

  10. #8
    Bezza's Avatar
    Join Date
    Jul 2010
    Posts
    456
    Thanks
    41
    Thanked 46 Times in 36 Posts
    Rep Power
    1

    Default

    Quote Originally Posted by Tolmandary View Post
    Be aware though that again TRIM doesn't work for SSD's in RAID arrays.
    Am I to assume it's not a good idea to put SSDs in RAID arrays then? I was going to on my new build, for no reason other than I can so why not, but if that's a bad idea on account of not being able use TRIM, I'll have to have a rethink (and also wish I had bought the 512GB version istead of 2 x 256GB )
    i7 3770K @ 4.1Ghz (to overclock more) ¦ Noctua NH-D14 Cooler ¦ Asus Sabertooth Z77 ¦ 16GB Corsair Vengeance LP @ 1600Mhz ¦ KFA2 670 OC 4GB ¦ 2 x 256GB & 1 x 64GB Crucial M4 SSD ¦ Corsair TX 850w ¦ Antec P182 ¦ W7 Professional 64 ¦ 27" Yamakasi Catleap 2560 x 1440 ¦ Asus Xonar DX ¦ Alesis M1 Active 520

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •