The Caviar Black WD1002FAEX wins this test, featuring excellent deferred writing algorithms. Being as fast as the RE4 WD1003FBYX at pure reading and writing, it is much faster under mixed loads. The 7200.12 series disks deliver the same performance at any reads/writes ratio whereas the energy-efficient models cope well with this test. The LP ST31000520AS isn’t much slower than the WD drives whereas the Barracuda LP ST1000DL002 catches up with the ordinary WD disks at writing. That’s an excellent result for 5900RPM HDDs.
The request queue getting longer, the RE4 series model gets better. The Caviar Black WD1002FAEX doesn’t enjoy such an overwhelming advantage at mixed loads as before. The Caviar Blue WD10EALS, Caviar Blue WD10EALX and Caviar Black WD1001FALS draw neat graphs without any defects whereas the 7200.12 series products are good until 60% writes but slow down at 80% writes.
The Barracuda LP ST1000DL002 performs very well and even catches up with the WD team at 100% writes. The Barracuda LP ST31000520AS is good at pure reading and writing but doesn’t like mixed loads.
When the queue is as long as 16 requests, Seagate’s 7200.12 series HDDs compete with the regular products from WD at reading but fail to do so at high percentages of writes. Meanwhile, the Barracuda LP ST1000DL002 behaves differently. Its caching algorithms are optimized for this load, as opposed to the Barracuda LP ST31000520AS which slows down even at 10% writes.
The WD drives behave exactly as at a queue depth of 4 requests. The RE4 WD1003FBYX and Caviar Black WD1002FAEX are unrivalled in this test.
The Caviar Black WD1002FAEX and RE4 WD1003FBYX are on top again although the slump at 90% is now more conspicuous. The standings of the other HDDs have changed. They have got closer to each other, and the Barracuda LP ST1000DL002 is just as good as others.
The RE4 WD1003FBYX and Caviar Black WD1002FAEX are in the lead again. WD’s regular drives deliver similar performance. The Barracuda 7200.12 ST31000528AS and the Barracuda LP ST31000520AS join the group of WD drives, although have completely different graphs. The Barracuda LP ST1000DL002 and 7200.12 ST31000524AS do not do very well here.