time dd if=/dev/zero of=test.dat bs=4k count=500000
2048000000 bytes (1.9GB) copied, 26.336280 seconds, 74.2MB/s
0m26.42s real 0m0.54s user 0m15.47s system
time dd if=test.dat of=/dev/null bs=4k
2048000000 bytes (1.9GB) copied, 16.410703 seconds, 119.0MB/s
0m16.42s real 0m0.28s user 0m11.74s system
{var%20f='http://v.t.sina.com.cn/share/share.php?appkey=1515056452',u=z||d.location,p=['&url=',e(u),'&title=',e(t||d.title),'&source=',e(r),'&sourceUrl=',e(l),'&content=',c||'gb2312','&pic=',e(p||'')].join('');function%20a(){if(!window.open([f,p].join(''),'mb',['toolbar=0,status=0,resizable=1,width=440,height=430,left=',(s.width-440)/2,',top=',(s.height-430)/2].join('')))u.href=[f,p].join('');};if(/Firefox/.test(navigator.userAgent))setTimeout(a,0);else%20a();})(screen,document,encodeURIComponent,'','','https://www.xiaopingtou.cn/data/attach/logo/logo.png', '推荐 lyxer 的问题《i.mx6的SATA速度有多少（已解决）》','https://www.xiaopingtou.net/q-174128.html','页面编码gb2312|utf-8默认gb2312'));){kind=link}
结果来了。读的应该满足你的要求了，119，写的不够，只有74，不过我是用的的SSD在安卓下测试的，Linux下不知道。我现在只有安卓。
time dd if=/dev/zero of=test.dat bs=4k count=500000
2048000000 bytes (1.9GB) copied, 26.336280 seconds, 74.2MB/s
0m26.42s real 0m0.54s user 0m15.47s system
time dd if=test.dat of=/dev/null bs=4k
2048000000 bytes (1.9GB) copied, 16.410703 seconds, 119.0MB/s
0m16.42s real 0m0.28s user 0m11.74s system
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