ST3600057SS Seagate Cheetah 600GB 15K SAS: Replace or Migrate?
The ST3600057SS is a Seagate Cheetah 15K.7 600GB SAS drive in 3.5 inch form factor, and it is the drive people search for when a 15K array from the last decade loses a member. This covers what it is, what replaces it, and when to stop replacing it.
What is the Seagate ST3600057SS?
A 600GB, 15,000 RPM, SAS 6Gb/s enterprise hard drive in 3.5 inch form factor, from the Cheetah 15K.7 generation. It was the performance drive of its era, fitted to servers and arrays that needed the fastest mechanical storage available.
It has not been manufactured for years. Supply is refurbished and new-old-stock, and it thins annually. Our availability guide covers why that matters for planning.
Why is it still searched for?
Because arrays built from it are still running.
A RAID group of 15K drives runs at the speed of its slowest member, so replacing a failed ST3600057SS with a slower or smaller drive degrades the whole array. The only clean replacement is the same drive or a direct equivalent. Our RAID guide covers why matching matters.
And 3.5 inch 15K drives are a specific thing. Later 15K drives moved to 2.5 inch, so a chassis with 3.5 inch bays and a 15K array has no modern direct equivalent.
What can replace the ST3600057SS?
Three options, in order of preference.
The same part number, refurbished or new-old-stock. Cleanest for an existing array. Check hours and health data — our hours guide covers judging them.
A vendor-coded equivalent from the same era, if the drive was originally sold under an HPE, Dell or IBM part number. Our OEM guide covers when the vendor version is required.
A 2.5 inch 15K drive in a 3.5 inch adapter carrier, where the platform supports it. Not always reliable in hot-swap bays, and controller behaviour varies. Test before committing.
Should I replace the drive or the array?
The honest question at this age.
An SSD outperforms any 15K mechanical drive comfortably, and a small enterprise SSD costs less than a 15K drive from a thinning market. If the controller handles SSDs properly, migrating the array to flash is usually the better answer than sourcing another Cheetah. Our SSD versus HDD guide covers when flash pays, and our controller guide covers checking whether yours can use it.
Where the platform cannot take SSDs, or the system is fixed and cannot be migrated, hold spares. Two tested drives on the shelf turns the next failure into a swap. Our spares guide covers this.
What to check before buying
Four things.
Form factor — 3.5 inch. Confirm your bay.
Interface — SAS. A SATA controller cannot use it.
Sector format — match the array. Our sector format guide covers this.
Carrier — bare drive, needs the correct generation carrier for hot-swap. Our caddies guide covers this.
Frequently asked questions
Is the ST3600057SS still available?
As refurbished and new-old-stock, yes, though supply thins every year. It has not been manufactured for years. Hold spares if you depend on it.
What is the modern equivalent of the Cheetah 15K.7?
There is no modern 3.5 inch 15K drive. Later 15K drives moved to 2.5 inch. For performance, an enterprise SSD outperforms any 15K drive and is usually the better replacement where the controller supports it.
Can I replace it with a 10K or 7200 drive?
In a RAID array, the group runs at the speed of its slowest member, so a slower replacement degrades the whole array. Match 15K with 15K, or migrate the array to SSD.
Will a 2.5 inch 15K drive work in a 3.5 inch bay?
With an adapter carrier, sometimes. It is not always reliable in hot-swap bays and controller behaviour varies. Test before committing to it for an array.
Should I buy refurbished ST3600057SS drives?
For an existing array that cannot be migrated, yes, with hours and health data checked. For anything new, no; an enterprise SSD is a better and cheaper answer.
Does it come with a caddy?
No. Bare drive. Hot-swap bays need the correct generation carrier for your chassis, sourced separately.
Seagate Cheetah 15K.7
ST3600057SS 600GB 15K SAS 3.5" Hard Drive
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