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J. Roeleveld wrote: |
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> On Tuesday, July 01, 2014 11:06:59 AM Helmut Jarausch wrote: |
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>> On 07/01/2014 10:58:45 AM, Dale wrote: |
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>> Probably not. All of my external USB3 disks have a separate power |
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>> supply. |
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> I only know of 2.5" USB-drivers that are powered via the same USB-cable. |
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> Never seen 3.5" ones that are USB-powered. |
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> |
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> I use 2.5" drives for my backups, as they are designed for laptop use, I have |
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> the feeling they are a bit more robust when it comes to accidental bumps. |
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I thought those things looked like they had their own power. Neat. |
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> |
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>>> root@fireball / # hdparm -tT /dev/sdb |
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>>> |
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>>> /dev/sdb: |
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>>> Timing cached reads: 6604 MB in 2.00 seconds = 3303.39 MB/sec |
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>>> Timing buffered disk reads: 542 MB in 3.01 seconds = 180.33 MB/sec |
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>>> |
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>>> root@fireball / # |
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>> Try a real life example like dd. I have seen the above mentioned speed |
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>> on disks with a file system on it which does limit the speed anyway. |
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> +1 |
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> |
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> -- |
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> Joost |
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> |
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> |
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I watched the dd process when I was erasing the old drive. I got about |
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the same results. It started out a little over 200 and went as low as |
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170 or so close to the end. On average, about what hdparm shows. Close |
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enough it seems. ;-) |
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Dale |
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:-) :-) |
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