I can't recommend a specific HDD speed test utility, but I'm sure others can - there are several. However, let me caution you on expectations. You will NEVER see an average data transfer speed of 150 to 300 MB/s when you test a SATA drive. The actual speeds vary to some extent across the drive because of rotational speeds and data density, but they will range in the area from 30 to 100 MB/s, and average over the whole disk surface will probably be from 40 to 80 MB/s. The 150 or 300 numbers in SATA specs are the MAXIMUM BURST data rate, but real-world averages are affected by many things and come out significantly slower. That's OK, because the same realities affect all disk systems. The recent exceptions that manage to beat some of these realities are among the SSD units that have no moving parts.