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Groups > comp.sys.mac.system > #119495
| From | Lewis <g.kreme@gmail.com.dontsendmecopies> |
|---|---|
| Newsgroups | comp.sys.mac.system |
| Subject | Re: keeping files on an external drive |
| Date | 2018-11-12 12:55 +0000 |
| Organization | Miskatonic U |
| Message-ID | <slrnpuiu24.2jnq.g.kreme@Snow.local> (permalink) |
| References | (3 earlier) <081120181244369756%nospam@nospam.invalid> <slrnpu9i78.ct8.g.kreme@jaka.local> <psba6e$hbd$1@dont-email.me> <1ny68jv.41v5k5qtlw3bN%dempson@actrix.gen.nz> <1ny6ahq.1z0fbs313h6gvuN%dempson@actrix.gen.nz> |
In message <1ny6ahq.1z0fbs313h6gvuN%dempson@actrix.gen.nz> David Empson <dempson@actrix.gen.nz> wrote: > David Empson <dempson@actrix.gen.nz> wrote: >> J Burns <burns@nospam.com> wrote: >> >> > On 11/8/18 6:38 PM, Lewis wrote: >> > >> 128 gig is a bit tight. >> > >> > > Very. My Applications folder is 160GB and while 60GB of that is World of >> > > Warcraft that I would not have on a laptop, it's still a lot of space. >> > >> > Ben Lovejoy of 9 to 5 Mac meant to order his mini with 128 GB. By >> > mistake, he ordered 256. >> >> Are you talking about this review? >> >> https://9to5mac.com/2018/11/10/review-2018-mac-mini-video/ >> >> It was written by Jeff Benjamin, not Ben Lovejoy. >> >> > He plugged in a Samsung X5, and Blackmagic showed it to be vastly faster >> > than the internal SSD. It all stems from System 8's support for Firewire >> > and USB. >> >> Um, what? System 8 has nothing to do with this review, there is no >> Firewire anywhere, USB is not relevant to this test. >> >> The Samsung X5 was only 3% faster for read, but 42% faster for write. >> The better write speed is probably due to the X5 being higher capacity >> (at least 500 GB compared to 256 GB internal SSD). >> >> It is a common pattern with SSDs in the same family that higher capacity >> models can write faster than lower capacity models. This is because >> flash memory is slower for writing than reading, higher capacity SSDs >> have more flash memory chips, and they are arranged in parallel so the >> greater number of chips means more data can be written at the same time. >> >> Read doesn't benefit from the increased parallelism because the read >> speed of a single flash memory chip is usually fast enough to saturate >> the interface bus and/or controller. >> >> My Mac Mini should be arriving tomorrow and will have a 512 GB internal >> SSD, so I'll be able to add another data point to the write speed >> comparison. > I missed it on first read, but the article includes a tweet from Paul > Haddad which lists the write speeds he observed for 2018 Mac Mini SSDs. > 128 GB: ~600 MB/s > 256 GB: ~1.3 GB/s (matching the 9to5Mac review model) > 512 GB: ~1.9 GB/s (faster than the Samsung X5) > 1 TB: ~2.6 GB/s This is probably because the drives are actually two SSDs linked together by the T2, so the 128 is 2x84 and the 1TB is 2x512. This gives greater speeds than a single SSD of the larger size and explains why the 512GB is much faster than the Samsung X5 external. > 2 TB is not mentioned but it is probably not much faster than 1 TB due > to bus speed limits, given read is about 2.5 GB/s for a 256 GB SSD. > This suggests the flash memory chip configuratons in the SSD are > something like this: > 128 GB: 2 x 64 GB > 256 GB: 4 x 64 GB, twice as many chips so twice as fast > 512 GB: 4 x 128 GB, higher capacity, square geometry so sqrt(2) faster > 1 TB: 4 x 256 GB, higher capacity, square geometry so sqrt(2) faster I hadn't thought of the possibility of 4 SSDs as I suspect they are using the same system they used in the iMac Pro, and thy specifically mentioned that used two. But sure, that would make sense too. Your numbers match up, so it seems likely. -- National Socialism is not Socialism, any more than the Black Panthers were actually cats. @jearl
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keeping files on an external drive J Burns <burns@nospam.com> - 2018-11-08 08:44 -0500
Re: keeping files on an external drive Wade Garrett <wade@cooler.net> - 2018-11-08 09:13 -0500
Re: keeping files on an external drive J Burns <burns@nospam.com> - 2018-11-08 09:47 -0500
Re: keeping files on an external drive nospam <nospam@nospam.invalid> - 2018-11-08 09:57 -0400
Re: keeping files on an external drive Wade Garrett <wade@cooler.net> - 2018-11-08 10:29 -0500
Re: keeping files on an external drive nospam <nospam@nospam.invalid> - 2018-11-08 10:49 -0400
Re: keeping files on an external drive nospam <nospam@nospam.invalid> - 2018-11-08 09:49 -0400
Re: keeping files on an external drive Tim Streater <timstreater@greenbee.net> - 2018-11-08 14:52 +0000
Re: keeping files on an external drive Jolly Roger <jollyroger@pobox.com> - 2018-11-08 16:09 +0000
Re: keeping files on an external drive J Burns <burns@nospam.com> - 2018-11-08 12:02 -0500
Re: keeping files on an external drive Tim Streater <timstreater@greenbee.net> - 2018-11-08 17:31 +0000
Re: keeping files on an external drive Your Name <YourName@YourISP.com> - 2018-11-09 08:03 +1300
Re: keeping files on an external drive nospam <nospam@nospam.invalid> - 2018-11-08 14:22 -0500
Re: keeping files on an external drive "J.Albert" <j.albert@nowhere.net> - 2018-11-09 22:29 -0500
Re: keeping files on an external drive Jolly Roger <jollyroger@pobox.com> - 2018-11-08 16:08 +0000
Re: keeping files on an external drive J Burns <burns@nospam.com> - 2018-11-08 12:27 -0500
Re: keeping files on an external drive nospam <nospam@nospam.invalid> - 2018-11-08 12:44 -0500
Re: keeping files on an external drive Lewis <g.kreme@gmail.com.dontsendmecopies> - 2018-11-08 23:38 +0000
Re: keeping files on an external drive J Burns <burns@nospam.com> - 2018-11-12 02:30 -0500
Re: keeping files on an external drive dempson@actrix.gen.nz (David Empson) - 2018-11-12 21:57 +1300
Re: keeping files on an external drive dempson@actrix.gen.nz (David Empson) - 2018-11-12 22:14 +1300
Re: keeping files on an external drive Lewis <g.kreme@gmail.com.dontsendmecopies> - 2018-11-12 12:55 +0000
Re: keeping files on an external drive dempson@actrix.gen.nz (David Empson) - 2018-11-13 19:52 +1300
Re: keeping files on an external drive Lewis <g.kreme@gmail.com.dontsendmecopies> - 2018-11-12 12:51 +0000
Re: keeping files on an external drive dempson@actrix.gen.nz (David Empson) - 2018-11-13 19:52 +1300
Re: keeping files on an external drive J Burns <burns@nospam.com> - 2018-11-12 12:19 -0500
Re: keeping files on an external drive nospam <nospam@nospam.invalid> - 2018-11-12 12:31 -0500
Re: keeping files on an external drive Lewis <g.kreme@gmail.com.dontsendmecopies> - 2018-11-12 22:41 +0000
Re: keeping files on an external drive J Burns <burns@nospam.com> - 2018-11-13 15:10 -0500
Re: keeping files on an external drive Alan Baker <nunya@ness.biz> - 2018-11-13 12:24 -0800
Re: keeping files on an external drive J Burns <burns@nospam.com> - 2018-11-13 17:11 -0500
Re: keeping files on an external drive Alan Baker <nunya@ness.biz> - 2018-11-13 15:02 -0800
Re: keeping files on an external drive J Burns <burns@nospam.com> - 2018-11-14 00:41 -0500
Re: keeping files on an external drive Alan Baker <nunya@ness.biz> - 2018-11-15 11:26 -0800
Re: keeping files on an external drive dempson@actrix.gen.nz (David Empson) - 2018-11-14 13:34 +1300
Re: keeping files on an external drive JF Mezei <jfmezei.spamnot@vaxination.ca> - 2018-11-14 15:42 -0500
Re: keeping files on an external drive dempson@actrix.gen.nz (David Empson) - 2018-11-15 12:04 +1300
Re: keeping files on an external drive JF Mezei <jfmezei.spamnot@vaxination.ca> - 2018-11-15 00:52 -0500
Re: keeping files on an external drive dempson@actrix.gen.nz (David Empson) - 2018-11-15 22:24 +1300
Re: keeping files on an external drive Lewis <g.kreme@gmail.com.dontsendmecopies> - 2018-11-14 04:57 +0000
Re: keeping files on an external drive ANTant@zimage.com (Ant) - 2018-11-08 21:17 -0600
Re: keeping files on an external drive Your Name <YourName@YourISP.com> - 2018-11-09 18:29 +1300
Re: keeping files on an external drive J Burns <burns@nospam.com> - 2018-11-09 02:24 -0500
Re: keeping files on an external drive Your Name <YourName@YourISP.com> - 2018-11-10 09:37 +1300
Re: keeping files on an external drive ANTant@zimage.com (Ant) - 2018-11-09 16:26 -0600
Re: keeping files on an external drive Lewis <g.kreme@gmail.com.dontsendmecopies> - 2018-11-09 22:57 +0000
Re: keeping files on an external drive Your Name <YourName@YourISP.com> - 2018-11-10 13:55 +1300
Re: keeping files on an external drive J Burns <burns@nospam.com> - 2018-11-10 00:21 -0500
Re: keeping files on an external drive ANTant@zimage.com (Ant) - 2018-11-09 16:28 -0600
Re: keeping files on an external drive Your Name <YourName@YourISP.com> - 2018-11-10 13:58 +1300
Re: keeping files on an external drive Jolly Roger <jollyroger@pobox.com> - 2018-11-10 01:20 +0000
Re: keeping files on an external drive Elden <usenet@moondog.org> - 2018-11-09 21:33 -0800
Re: keeping files on an external drive dempson@actrix.gen.nz (David Empson) - 2018-11-10 18:52 +1300
Re: keeping files on an external drive Your Name <YourName@YourISP.com> - 2018-11-10 19:08 +1300
Re: keeping files on an external drive dempson@actrix.gen.nz (David Empson) - 2018-11-11 11:20 +1300
Re: keeping files on an external drive Your Name <YourName@YourISP.com> - 2018-11-11 17:49 +1300
Re: keeping files on an external drive Your Name <YourName@YourISP.com> - 2018-11-10 19:07 +1300
Re: keeping files on an external drive nospam <nospam@nospam.invalid> - 2018-11-10 08:38 -0500
Re: keeping files on an external drive Elden <usenet@moondog.org> - 2018-11-10 08:41 -0800
Re: keeping files on an external drive J Burns <burns@nospam.com> - 2018-11-10 14:35 -0500
Re: keeping files on an external drive Your Name <YourName@YourISP.com> - 2018-11-11 10:02 +1300
Re: keeping files on an external drive Lewis <g.kreme@gmail.com.dontsendmecopies> - 2018-11-11 07:22 +0000
Re: keeping files on an external drive Jolly Roger <jollyroger@pobox.com> - 2018-11-08 20:25 +0000
Re: keeping files on an external drive Lewis <g.kreme@gmail.com.dontsendmecopies> - 2018-11-08 23:24 +0000
Re: keeping files on an external drive Jolly Roger <jollyroger@pobox.com> - 2018-11-09 15:14 +0000
Re: keeping files on an external drive Lewis <g.kreme@gmail.com.dontsendmecopies> - 2018-11-09 15:30 +0000
Re: keeping files on an external drive Jolly Roger <jollyroger@pobox.com> - 2018-11-09 17:12 +0000
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