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Thread: ssd capacity

  1. #1
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    Default ssd capacity

    I'm researching prices on sata ssd replacement drives in a couple of computers (waiting for the Memorial Day sales.) I have a question on drive capacity as it relates to the technology. Most of the brand name drives are listed (for my needs) at 500GB. Some of the store-brand drives are listed at 512GB. What is the difference? And don't say 12GB!!!!

    Others are listed as 480GB and 240GB. Is there a difference in the underlying technology that accounts for the size variation? The newest, most popular, ssd are listed in the round numbers, i.e. 250GB, 500GB, 1TB. Does that mean the 512GB drives use older technology? Is there a reason to avoid the generic drives, or even the brand names, that have 512GB capacity?
    Any sufficiently advanced technology is indistinguishable from magic. - Arthur C. Clarke

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    Default AW: ssd capacity


  3. #3
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    Default Re: ssd capacity

    Are you sure they all say GB? Do not some refer to GB and others to GiB?
    Henk van Velden

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    Default Re: ssd capacity

    Please read the fine print in the manufacturer spec sheet, there should be an explanation of what they mean by "GB".
    Then consider that SSDs have some spare capacity reserved for wear-out balance or bad cell replacement and we simply don't know (in general) how much spare space they have reserved beyond advertised capacity; so I think that inferring technology or raw capacity from advertised capacity alone is useless.
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    Default Re: ssd capacity

    Quote Originally Posted by Prexy View Post
    What is the difference?
    Marketing.

    As best I can tell, all disk drive sellers try to make their drives look bigger than they actually are.
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  6. #6
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    Lightbulb Re: ssd capacity

    Quote Originally Posted by Prexy View Post
    (waiting for the Memorial Day sales.)
    Given the current market situation, I wouldn't wait – it looks as if everything containing semi-conductors will increase in price …

    GiB or GB – TiB or TB –
    • Without an “i” it's a marketing capacity …
    • For capacities less than or equal to 512 GB, usually a power of 2 was advertised – 512 MB, 1024 MB, 2 GB, 4 GB, 8 GB, 16 GB, 32 GB, 64 GB, 128 GB, 256 GB, 512 GB …
    • With terabyte, it's simply 1 TB, 2 TB, 3 TB …

    Whichever drive you purchase, Linux will report less than what the label indicates – for example, 128 GB, 1 TB, 4 TB and, 500 GB drives –
    Code:
     # inxi --disk
    Drives:    Local Storage: total: 5.11 TiB
               ID-1: /dev/sda vendor: Intenso model: SSD Sata III size: 111.79 GiB 
               ID-2: /dev/sdb vendor: Western Digital model: WD10EZEX-60M2NA0 size: 931.51 GiB 
               ID-3: /dev/sdc vendor: Western Digital model: WD40EZRZ-22GXCB0 size: 3.64 TiB 
               ID-4: /dev/sdd vendor: Seagate model: ST3500418AS size: 465.76 GiB 
     #

  7. #7
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    Default Re: ssd capacity

    Quote Originally Posted by Prexy View Post
    I'm researching prices on sata ssd replacement drives in a couple of computers (waiting for the Memorial Day sales.) I have a question on drive capacity as it relates to the technology. Most of the brand name drives are listed (for my needs) at 500GB. Some of the store-brand drives are listed at 512GB. What is the difference? And don't say 12GB!!!!

    Others are listed as 480GB and 240GB. Is there a difference in the underlying technology that accounts for the size variation? The newest, most popular, ssd are listed in the round numbers, i.e. 250GB, 500GB, 1TB. Does that mean the 512GB drives use older technology? Is there a reason to avoid the generic drives, or even the brand names, that have 512GB capacity?
    A popular model: 500GB Crucial MX500 2.5" (6.4cm) SATA 6Gb/s 3D-NAND TLC (CT500MX500SSD1). I bought the 250GB model last year.
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  8. #8
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    Default Re: ssd capacity

    I've been choosing to buy only SSDs sized to powers of 2, so only 128, 256 or 512, except for a couple of 120 from before adopting the policy.
    Reg. Linux User #211409 *** multibooting since 1992
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  9. #9
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    Default Re: ssd capacity

    Thanks to all for the answers. @karlmistelberger mentioned 3D-Nand TLC. That touched on what I thought. Perhaps, the size designation might have been related to the chip architecture or something and one designation meant a superior product. Now I see as @nrickert said: "it's marketing."
    Any sufficiently advanced technology is indistinguishable from magic. - Arthur C. Clarke

  10. #10
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    Default Re: ssd capacity

    Quote Originally Posted by Prexy View Post
    Thanks to all for the answers. @karlmistelberger mentioned 3D-Nand TLC. That touched on what I thought. Perhaps, the size designation might have been related to the chip architecture or something and one designation meant a superior product. Now I see as @nrickert said: "it's marketing."
    I also have a BX drive:
    Code:
    erlangen:~ # inxi -D 
    Drives:    Local Storage:total: 6.38 TiB used: 3.14 TiB (49.2%)  
               ID-1: /dev/nvme0n1 vendor: Samsung model: SSD 950 PRO 512GB size: 476.94 GiB  
               ID-2: /dev/sda vendor: Crucial model: CT2000BX500SSD1 size: 1.82 TiB  
               ID-3: /dev/sdb vendor: Western Digital model: WD40EZRX-22SPEB0 size: 3.64 TiB  
               ID-4: /dev/sdc vendor: Samsung model: SSD 850 EVO 500GB size: 465.76 GiB  
    erlangen:~ #
    AMD Athlon 4850e (2009), openSUSE 13.1, KDE 4, Intel i3-4130 (2014), i7-6700K (2016), i5-8250U (2018), AMD Ryzen 5 3400G (2020), openSUSE Tumbleweed, KDE Plasma 5

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