Will I get better speeds from my 5400rpm hard drive when it is inside
an enclosure providing USB 3.0 connectivity?
That depends what you are comparing it with. Speeds over USB (1 or 2 or 3) will be slower than directly in the laptop since you are adding protocol overhead.
Or what will the possible speeds be?
Assuming that the drive is fast enough (and most 5400 RPM laptop drives seem to yield read speeds of about 90MB/sec and slightly lower write speeds) then you will get:
- Internal: 90MB/sec
- External eSATA: 90MB/sec
- External USB2: about 30-35MB/sec (limited by USB 2 speed)
- External USB3.0 / USB3.1 gen 1 (5.0Gbit/sec): About 10x the speed from USB2. Which probably comes close to the speed of the disk when used internally with a direct SATA connection minus overhead.
- External USB3.1 gen 2 (10.0Gbit/sec): Doubles the bandwidth of USB3.0 / USB3.1 gen 1. Since your disk is probably the slowest part this does not increase performance
- External USB3 with UASP support: Significantly less overhead, but probably still limited to the same speed due as the previous one because the disk cannot saturate the channel.
That was a lot of text, now to a practical answer :)
A laptop drive is usually significantly slower than USB3's transfer speed. So you get almost the same speed when you use a slow laptop disk in an USB case as when you use it internally.
If you still need to buy an external case: Look for one which supports UAS[P].
5Just a tip in case you've not thought about it. You can also replace DVD drive with Hard Disk in some laptop (Google Hard Drive Caddy) – VarunAgw – 2016-03-15T21:57:10.703
@VarunAgw That is so awesome! Never heard about that before! But unfortunately my laptop doesn't have an optical drive. I'm already using an external one. But thanks! That's really cool! – Mentos93 – 2016-03-15T22:11:34.490
6Please not that at least some USB enclosures mess with sector numbering, which means you can't use the HD in the enclosure without reformatting. This has happened more than once to me; be sure you have a backup of your original HD. – Guntram Blohm supports Monica – 2016-03-15T22:28:47.097
Actually tried this while going from a 5400RPM 1TB HDD to a 120GB SSD... HDD runs as fast as it used to on SATA with USB3. SSD is damn fast though. – Ave – 2016-03-16T15:15:59.507
@VarunAgw that is the best choice if your PC supports it, and is easy. My laptop requires ten minutes of taking it apart to reach the Optical Drive, but about 2 minutes to reach HDD/SSD. – Ave – 2016-03-16T15:17:16.977