Date: Mon, 2 Jan 2017 11:27:49 +0300 From: "Marat N.Afanasyev" <amarat@li.ru> To: FreeBSD stable <freebsd-stable@freebsd.org> Subject: usb 3.0 thumb drive speed limit Message-ID: <586A0F05.6050504@li.ru>
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This is a cryptographically signed message in MIME format. --------------ms000104070208050404080000 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: quoted-printable I wonder is there a speed limit on usb 3.0? I've bought ugen0.4: <SanDisk> at usbus0 umass2 on uhub7 umass2: <SanDisk Extreme, class 0/0, rev 2.10/0.10, addr 4> on usbus0 da2 at umass-sim2 bus 2 scbus9 target 0 lun 0 da2: <SanDisk Extreme 0001> Removable Direct Access SPC-4 SCSI device da2: Serial Number AA010808161609220143 da2: 40.000MB/s transfers da2: 59840MB (122552320 512 byte sectors) da2: quirks=3D0x2<NO_6_BYTE> that claims 'Up to 245 MBytes/sec read speed' and dd shows: % dd if=3D/dev/da2 of=3D/dev/null bs=3D1m count=3D1000 1000+0 records in 1000+0 records out 1048576000 bytes transferred in 25.688997 secs (40818098 bytes/sec) why we have such a limit? --=20 SY, Marat --------------ms000104070208050404080000 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCC 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