G-Speed Shuttle XL Thunder Bolt 3 support for 4Kn SAS drives

What the product supports

From the official specs & datasheets:

It is an 8-bay, transportable hardware RAID enclosure with dual Thunderbolt 3 ports.

It is shipped with enterprise-class 7200 RPM drives (SATA) in the standard configuration. E.g., the datasheet mentions “removable, reliable Enterprise-class 7200 RPM drives” (no mention of SAS interface) for the Thunderbolt 3 version.

Key specs list include “(8×) 7200 RPM Enterprise-class hard drives” and “Disk Speed: 7200 rpm” under the Thunderbolt 3 version.

The datasheet does not appear to explicitly state support for SAS interface drives. Instead, it treats this as an externally connected RAID via TB3 (likely internally SATA-based).

The question of sector format (512e vs 4Kn) is not addressed in the official documentation that we can locate.

Given the above, this enclosure appears built for SATA-interface drives (3.5″ enterprise class), likely 512n or 512e sector drives, and does not explicitly support SAS interface drives or 4Kn native sector drives.

What “4Kn SAS drives” means & why compatibility is a concern

“4Kn” stands for “4 K native sectors” – meaning the physical and logical sector size is 4096 bytes (rather than the legacy 512 bytes).

Many RAID/enclosure controllers (especially older ones) do not support 4Kn drives (or the mix of 512n/512e/4Kn) reliably. For example:

“4Kn drives – SAS only – could work … in non-RAID/pass-through configuration … Due to the variables involved, we do not recommend it.”

The interface matters: SAS vs SATA. While some SAS controllers accept SATA drives, the reverse (SAS drives in SATA backplane/enclosure) often does not work.

The sector‐size mismatch is another concern: mixing 4Kn with 512n/512e drives in a RAID array can lead to issues, as noted by white‐papers.

Does the Shuttle XL Thunderbolt 3 support 4Kn SAS drives?

Putting the pieces together:

The Shuttle XL TB3 version appears to use SATA enterprise‐class drives by default. No documentation explicitly mentions SAS interface support.

Because the controller and backplane are most likely SATA based (and designed for drives the manufacturer ships), inserting a SAS drive (especially 12 Gb/s SAS, 4Kn) may not be supported physically or logically.

Even if the backplane accepted SAS drives (which is unlikely without explicit support), the 4Kn sector format is another layer of risk — many RAID enclosures do not support 4Kn drives without firmware updates or special support.

No official statement by G-Technology/Western Digital is found saying they support 4Kn SAS drives in this enclosure.

Therefore, it is not safe to assume that the Shuttle XL supports 4Kn SAS drives. In fact, compatibility is unlikely, or at least not guaranteed.

What you should do if you’re considering using 4Kn SAS drives

Since support is uncertain, here are recommended steps:

Check with the manufacturer: Contact Western Digital / G-Technology support with the specific model and serial, ask explicitly: “Does this enclosure support SAS interface drives (12 Gb/s) and 4Kn sector format drives in its RAID backplane?”

Verify drive interface: Ensure your drives are not SAS unless the enclosure supports SAS. If they are SAS, you likely need a SAS backplane/enclosure, not a SATA-only one.

Confirm sector format: If drives are 4Kn (4096 bytes logical sectors), verify the enclosure’s controller supports that. If not, look for drives that are 512e (512 byte logical sectors) instead, which have much better compatibility.

Ensure uniformity in the RAID: If you use an array, all drives should have the same interface and sector format; mixing formats often causes issues.

Backup data & test: Before putting into production, test the configuration to ensure all drives are recognized, usable, and stable.

Summary

In short:

The G-Technology G-SPEED Shuttle XL Thunderbolt 3 is a solid, high-capacity 8-bay RAID unit with Thunderbolt 3, but it is designed for enterprise 7200 RPM SATA drives (per the specs).

It gives no guaranteed support for SAS interface drives, nor explicit support for 4Kn sector drives.

Because 4Kn SAS drives and non-compatible interfaces/controllers often lead to issues, using them in this enclosure would be risky unless you confirm explicit compatibility.

If you plan to use 4Kn SAS drives, you may be better off with a true SAS backplane enclosure and controller explicitly certified for those drives.

If you like, I can check for any community reports of folks successfully using 4Kn SAS drives with this exact model (or a modified version) — would you like me to do that?