Manufacturers love to tell us that solid-state drives are the future. Apparently, they use less power, are impossible to damage and are quick off the mark. Ever sceptical, PC Advisor headed to the Test Center to find out the truth.

Using flash-based storage in a laptop isn't a new idea. But to date the high cost of flash has prevented it replacing hard-disk drives in regular laptops, despite some advantages in power consumption, shock resistance, and speed.

As prices continue to drop, however, flash-based SSDs (solid-state drives) have become viable options for handling primary storage requirements. Moreover, today's roomiest SSDs have 32GB of memory, enough to do more than satisfy basic storage needs - making them competitive with 1.8in hard-disk drives, which range in capacity from 30GB to 80GB.

These SSDs, available from companies such as Samsung and SanDisk, are lightweight (the SanDisk UATA 5000, for example, weighs 59g) and can be found in the US in laptops from Dell, Fujitsu and Toshiba.

Are they worth the extra cost? In spite of price drops, SSDs cost £200 to £250 more than ordinary hard drives of the same capacity. To justify the price difference, SSD laptops must demonstrate significant performance benefits over notebooks equipped with standard hard drives.

To find out whether they do, we tested three pairs of ultraportable notebooks available in the US from Fujitsu and Dell.

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The PC Advisor SSD challenge

The two test models in each pair of laptops were identically configured, except that one had an SSD, and the other a typical 1.8in 4200rpm hard drive.

Two of the notebooks ran Windows XP Professional. These models were Dell's 2.8kg ATG D620 ($3,015 with SSD, $2,815 with a 80GB hard-disk drive - available in the UK with an 80GB hard drive for around £1,000 and upwards) and Fujitsu's 1.1kg LifeBook P1610 ($2,578 with SSD, $2,029 with a 30GB hard-disk drive - about £1,500 in the UK ). The third notebook, another LifeBook P1610 ($2,548 with SSD, $1,999 with a 30GB hard-disk drive) ran Windows Vista Business.

No clear winner

Results were mixed. In several cases, our tests bore out the advantages of SSD, in other cases, hard-disk-based models led the way.

Our benchmark suite for testing system performance, WorldBench 6, Beta 2, showed no definite pattern in overall results between SSD systems and hard-disk-drive systems.

For example, the two Dell ATG D620 models, packed with a 2.0GHz Core 2 Duo T7200 CPU and 1GB of memory, each earned a mark of 76 on WorldBench 6. In contrast, the two Fujitsu LifeBook P1610 units, configured with a 1.2GHz Core Solo U1400, 1GB of memory and Windows XP Professional, differed in performance. The SSD version received a score of 42, while the hard-drive version received a 39.

Interestingly, the performance difference was even more pronounced in the pair of Fujitsu P1610 models running Windows Vista Business.

Here, the SSD version of the notebook finished with a 36 on our WorldBench 6 beta tests, while the hard-drive version posted only a 30. The Vista-based Fujitsu system with the SSD did especially well on our Adobe Photoshop CS2 image-manipulation test, beating the hard-drive version by 36 percent. And on our Nero 7.0 Ultra Edition disk burning test the SSD version outperformed its HDD counterpart by 76 percent.

The SSDs achieved superior performance in all three pairings on only two types of applications: drive-intensive tests such as our Nero 7.0 Ultra Edition disc burning, and WinZip 10.0 file compression tests.

The SSD versions of the two Fujitsus also earned higher marks than their hard-disk doppelgangers on our Photoshop CS2 test, but on that test the hard-disk Dell outran the SSD Dell by 10 percent.

SSDs rock on hard-drive-intensive tasks

We did see decisive performance wins by the SSD models on the file read and write tests that we use for our hard-drive testing. (The read and write tests consist of reading and writing folders of files, and searching for files on a drive.)

On these tests, the SSD models bested their hard-drive counterparts in 11 out of 12 instances. Occasionally, the scores were close. On our Windows file search of 6.1GB of data, for example, the SDD Fujitsu Vista Business system notebook finished the test in 86 seconds, while its hard-drive-based twin finished the test in 100 seconds.

Still, in most cases, the SSD models were dramatically faster. The most extreme example - the XP Pro Fujitsu finished our large-file reading and writing test in 199 seconds, far ahead of the hard drive-equipped model, which finished the test in 533 seconds.