Review of SanDisk Extreme CompactFlash 32GB (SDCFXS-032G)

After my previous review of a Silicon Power 8GB CompactFlash memory card, I was looking around for more CF cards to review, in the hopes of finding a higher-performing card with S.M.A.R.T. health reporting and the ability of acting as a “fixed disk” (that is, identifying to the system as a hard drive rather than a removable disk), and decided to purchase this memory card from Amazon.

Advertised specifications

The card’s specifications indicate that the CompactFlash card is capable of 120MB/s sequential read and 60MB/s sequential write speeds, has a lifetime warranty and comes with a license key for a 1-year subscription to their RescuePRO data recovery software. It is advertised to have internal RTV (room-temperature vulcanization) silicone potting, has an operational temperature range of -25 to 85 degrees Celsius (-13 to 185 Fahrenheit), and uses their “ESP (Enhanced Super-Parallel) Technology” which I presume is some sort of proprietary multi-channel controller, and is UDMA 7 (167 MB/s maximum interface speed) capable.

Benchmark – Setup

To connect the card to my computer, I used a CompactFlash-to-IDE converter and a Marvell 88SE9128-based SATA/PATA host bus adapter. This allows me to use up to UDMA 6 (133 MB/s maximum interface speed) as UDMA 7 is basically restricted to cameras as it’s only part of the CompactFlash official specifications.

Benchmark – CrystalDiskMark

For this test, I manually zero-filled the card using Hard Disk Sentinel, formatted it with exFAT, then ran CrystalDiskMark, set to 3 runs with a 500MB file size using random data, all zeros (0x00), and all ones (0xFF).

Data Type Test Read (MB/s) Write (MB/s) IOPS Read IOPS Write
Random Sequential 103.2 52.45
512K Random 99.55 29.57
4K Random (QD1) 11.37 0.916 2775.2 223.6
4K Random (QD32) 17.24 1.413 4208.2 344.9
All 0 (0x00) Sequential 104.3 54.25
512K Random 98.27 31.22
4K Random (QD1) 11.36 1.1 2773.3 268.5
4K Random (QD32) 17.39 1.263 4244.5 308.4
All 1 (0xFF) Sequential 104.5 53.95
512K Random 98.05 25.84
4K Random (QD1) 11.19 1.112 2733 271.4
4K Random (QD32) 17.32 1.437 4229.3 351

It appears that there is no significant difference between the tests depending on what data was used for the benchmark.

Benchmark – AS SSD

As with CrystalDiskMark, I zeroed out the card and formatted it as exFAT before running the test.

Test Read Write
Sequential 99.70 MB/s 46.13 MB/s
4K 11.40 MB/s 0.74 MB/s
4K 64 Thread 12.80 MB/s 1.03 MB/s
Access Time 0.389 ms 5.504 ms
Score 34 6

Benchmark – Hard Disk Sentinel

I ran three separate benchmarks with Hard Disk Sentinel’s Surface Test feature, using the read and write (both empty and random data) tests, and used the Random Seek Test to measure the card’s responsiveness after filling it with empty and random data.

Test Speed
Read 0x00 95.20 MB/s
Read Random 97.30 MB/s
Write 0x00 49.81 MB/s
Write Random 49.04 MB/s
Seek Time 0x00 0.35 ms
Seek Time Random 0.37 ms

Once again, there does not appear to be any appreciable difference between an empty (zeroed-out) or full card.

Analysis – HWiNFO64

Now that the benchmarks are out of the way, let’s take a look at the card and what it can (and can’t) do. Let’s take a look at the details of the drive…

The card shows up as a regular IDE drive in HWiNFO, and has information about its CHS (Cylinder-Head-Sector) geometries and supported I/O interface speeds. Here we can see the card supports up to UDMA 7 but is running at UDMA 6 as because it is connected to a PC IDE bus.

Now for the kicker: Does the drive identify itself as a fixed or removable disk? Cross your fingers…

NOPE! The SanDisk Extreme CompactFlash card does NOT identify as a fixed disk, but instead as a removable drive. This means that the hopes of using this as a bootable Windows disk are now out the window. [ba-dum-tssh!]

Analysis – Hard Disk Sentinel

Looking at the Overview tab in HDS, something weird is happening. It states that “the hard disk status is PERFECT” yet it has no health or performance percentages available. If I open the Information tab, I can see that the SanDisk Extreme CompactFlash card does NOT support S.M.A.R.T. health reporting. Bummer. Additionally, it appears that Windows does not like removable IDE drives that lack S.M.A.R.T. and instead report garbage data (or data mirrored from another drive in the system).

Looking further inside the Information tab, we can see the features that the memory card does support. It supports DMA, Ultra DMA, APM (advanced power management), write caching, 48-bit LBA (logical block address) addressing, IORDY (flow control), a NOP (no-operation) command, and has the CFA (CompactFlash Association) feature set.

Since the card reported that it supported APM, I tried to enable it but the card refused to accept the command.


Overall, I like this card quite a bit. It has fast sequential I/O and a respectable random read speed. However, this is soiled by the fact that the card is configured to show up as a removable disk, which renders the card unusable as a Windows boot drive, and the lack of S.M.A.R.T. health and temperature reporting makes me a bit uneasy as I cannot track the card’s program-erase cycle count during use.

Oh well. Looks like the hunt for a fast, fixed-disk CompactFlash card continues…